Selected Scientific Activity – a Chronology


Go to the Chronology

This Chronology is informed by the following criteria: (1) chronologic order and (2) relevance. As an axception to the chronological rule, some particularly relevant entries appear higher up in their row. The table of Peirce’s scientific writings contains:

  • lecture series, conference papers, presentations read in person or sent in advance of the discussion;
  • Peirce’s writings as published during his lifetime (books, papers, reviews, translations, notes, obituaries); every item is identified with a number corresponding to the Comprehensive Bibliography and Index of the Published Works of Charles Sanders Peirce with a Bibliography of Secondary Studies. References are listed (when available) in the following order:(1) MSS; (2) Collected Papers; (3) critical edition; (4) Comprehensive Bibliography number.
  • Some relevant letters.



1st publication, titled  “Think Again!”, Harvard Magazine (W1: 20-24; P1).


Reports on the Thirteenth Annual Meeting of the American Association for the Advancements of Science (Daily Evening Traveller, P2-7).


“The Chemical Theory of Interpenetration” (W1: 95-100; P11).

November 12. Talk at the Cambridge High School Association titled “The Place in Our Age in the History of Civilization” (W1: 101-114; MS. 1638; P12).


Review of Lectures on the English Language, by George P. Marsh; The Works of William Shakespeare, by Richard Grant White; The English of Shakespeare illustrated in a Philological Commentary on his Julius Caesar, by George L. Craik (W1: 117-143; P13).


Nov., 12. Starts writing his Logic Notebook (MS. 339); the last entry will be Nov. 1909.

Harvard lectures on the “Logic of Science” (W1: 162-302; MSS. 340-350).


October, 24 – December, 1. Lowell Lectures: “Logic of Science; or Induction and Hypothesis” (W1: 358-504; MSS. 351-359; P17).

Memoranda Concerning the Aristotelean Syllogism. Printed at his own expenses (W1: 505-514; P18).


Presents to the American Academy of Arts and Sciences 5 papers on algebraic logic and theory of categories. They will be published the year after:

  1. – March, 12: On an Improvement in Boole’s Calculus f Logic (W2: 12-22; P30);
  2. – April, 9: On the Natural Classification of Arguments (W2: 23-48; P31);
  3. – May, 14: On a New List of Categories (CP 1.545-559; W2: 49-58; EP1 1-10; P32);
  4. – September, 10: Upon the Logic of Mathematics (W2: 59-69; P33);
  5. – November, 13: Upon Logical Comprehension and Extension (W2: 70-86; P34).

Review of The Logic of Chance, by J. Venn (W2: 98-104; P21).


“Astronomical Explanations” (P23).

“Calendars” (P24).

“Nominalism versus Realism” (W2: 144-154; P25).

The so-called “Cognitive Essays” appear on the Journal of Speculative Philosophy: Questions Concerning Certain Faculties Claimed for Man (CP 5.213-263; W2: 193-210; EP1 11- 27; P26); Some Consequences of Four Incapacities(CP 5.264.317; W2: 211-242; EP1 28-55; P27); (1869) Grounds of Validity of the Laws of Logic(CP 5.318-357; W2: 242-272; EP1 56-82; P41).

“What is Meant by “Determined”” (W2: 158; P28).

 “On an Improvement in Boole’s Calculus of Logic” (P30).

“On the Natural Classification of Arguments” (P31).

 “On a New List of Categories” (P32).

 “Upon the Logic of Mathematics” (P33).

 “Upon Logical Comprehension and Extension” (P34).


December, 14 – January, 18. Harvard lectures on “British Logicians” (P39). Lecture I. Early nominalism and realism (W2: 310-317; MS. 584); Lecture III. Ockham (W2: 317- 366; MS. 585); Whewell (W2: 337-345; MS. 586).

 March, 18. First review (of almost 300) for The Nation: “Professor Porter’s Human Intellect” (W2: 273 – 281; P43), where Peirce shows interest for what will become his “ethics of terminology”.

Corrections to the paper “On the spectrum of the Aurora Borealis” (P36).

 “Chronology, Eclipses ad Tides” (P38).

 “The Pairing of the Elements (W2: 282-283; P40).

 “Roscoe’s “Spectrum Analysis” (W2: 285-289; P44).

 “The English Doctrine of Ideas” (W2: 302-307; P45).


  • Writes “Description of a Notation for the Logic of Relatives, Resulting from an Amplification of the Conceptions of Boole’s Calculus of Logic” (W2: 359-429; P52), a milestone in logic of relatives.
  • “Astronomical Information, Etc.” (P49).
  • “Calendars” (P50).
  • “The Spectroscope” (P51).
  • “Bain’s Logic” (P53).
  • Review of The Secret of Swedemborg: being an Elucidation of his Doctrine of Divine Natural Humanity, by Henry James (P54).
  • “On the Theory of Errors of Observation”, report for the United States Coast Survey (W3:114-137; P77).
  • Brief correspondence with W.S. Jevons (W2: 445-447; L 227).


  • Reveiw of Alexander Campbell Fraser’s edition of The Works of George Berkeley (CP 8.7-38; W2: 462-486; EP1 83-107; P60) for the North American Review.
  • Note on Babbage and James Mill Peirce (P57).
  • Note on De Morgan (W2: 448-450; P56).
  • “Mr. Peirce and The Realists” (W2: 490; P59).
  • “Logic”, lecture sereise that Peirce had to hlold at Harvard – cancelled  because Peirce was in Europe at the time. 


  • “On the Appearance of Encke’s Comet as seen at Harvard College Observatory” (P61), paper read before the Philosophical Society di Washington .
  • “On photometric measurement of the stars” (P63); paper read by the Academy of Arts and Sciences.
  • “Astronomical” (P64).
  • “Calendars” (P65).
  • “Educational Textbooks II” (P66).
  • Publishes “On Stellar Photometry” (P67) and “On the Coincidence of the Geographical Distribution of Rainfall and of Illiteracy, as shown by the Statistical Maps of the Ninth Census Reports” (P68), by the Philosophical Society di Washington.
  • (Observation), “Solar eclipse of August 7, at Shelbyville, Kentucky” (P69), in Report of the Superintendent of the United States Coast Survey.
  • (Observations and Research, Solar eclipse of 7 August 1869) (P70), in Report of the Superintendent of the United States Coast Survey.


  • “Astronomical” (P71).
  • Calendars” (P72).
  • “Lazelle’s One Law in Nature” (P73).
  • “On Logical Algebra” (P75); paper read by the Philosophical Society of Washington.
  • Observation, Solar Eclipse of 22 December 1870) (P76), in Report of the Superintendent of the United States Coast Survey.
  • “On the Theory of Errors of Observations” (P77).


  • “Astronomical” (P79).
  • “Calendars” (P80).
  • “Rainfall” (P81).
  • “On Quaternions, as developed from the General Theory of the Logic of Relatives” (P82); paper read by Philosophical Society of Washington.
  • “On various Hypotheses in Reference to Space” (P83); paperread by the Philosophical Society of Washington.
  • (Observations, Solar Eclipse of 22 December 1870) (P85), in Report of the Superintendent of the United States Coast Survey.
  • (Observations, Solar Eclipse of 22 December 1870) (P86),in Report of the Superintendent of the United States Coast Survey.


  • “Photometric Measurements of the Stars” (P87); paper read at the Academy of Arts and Sciences.
  • “The Theory of Errors of Observation” (P88).
  • “A Plan and an Illustration” (P89).
  • “On the Application of Logical Analysis to Multiple Algebra” (W3: 177-179; P90).
  • September, 20-29. Peirce is the first American delegate to the International Geodetic Association meeting in Paris; he presents an innovative thesis on pendular motion (P97).


  • “On a new edition of Ptolemy’s catalogue of stars” (P89).
  • “Logical Contraposition and Conversion” (W3: 191-194; P99).


  • Reads “Note on Grassmann’s Calculus of Extension”.
  • “Note on Sensation of Color” (W3: 211-215; P100 e P105).
  • “List of Latitude Stars Employed in the Coast Survey” (P101).
  • “De l’influence de la flexibilité du trépied sur l’oscillation du pendule à réversion; Note communiquée par Mr. E. Plantamour” lithography distributed at the Geodetic conference.
  • “Nicholas St. John Green” (W3: 208-210; P108).


  • November, 1877 – August 1878. The “Illustrations of the Logic of Science,” a series of 6 papers that include the famous “The Fixation of Belief” (1877) and “How to Make Our Ideas Clear” (1878), appear on the Popular Science Monthly. The complete list is:
  • – (1877) The Fixation of Belief (CP 5.358-387; W3: 242-257; EP1 108-123; P107). It came out in French first (W3: 338-354; P129);
  • – How to Make Our Ideas Clear (CP 5.388-410; W3: 257-276; EP1: 124-141; P119); in French (W3: 355-374; P162);
  • – The Doctrine of Chances (W3: 276-289; EP1 142-154; P120);
  • – The Probability of Induction (W3: 290-30; EP1 153-170; P121);
  • – The Order of Nature (W3: 306-322; EP1: 170-185; P122);
  • – Deduction, Induction, and Hypothesis (W3: 323-337; EP1 186-199; P123).
  • Publishes in August the Photometric Researches, the result of his work at the Harvard astronomy in the years 1872-1875 (partially republished in W3: 382-494; P118).
  • “Note on Grassman’s Calculus of Extension” (W3: 238-239; P125).
  • Reveiw of Esposizione del Metodo dei Minimi Quadrati, by Annibale Ferrero (W3: 375-381; P111).
  • Review of Popular Astronomy, by Simon Newcomb (P114).
  • “On the acceleration of gravity at initial stations” (P115); paper read at the National Academy of Sciences a New York.
  • “Floating Magnets” (P117).
  • “On the Influence of Internal Friction upon the Correction of the Length of the Seconds’ Pendulum for the Flexibility of the Support” (P126).
  • (Attendance and remarks, International Geodetic Conference, Stuttgart, 1877) (P130).


“On the Reference of the Unit of Length to the Wavelengths of Light”, paper read by the American Academy of Art and Sciences, Boston.

“On the Ghost in Rutherfor’s Diffraction-Spectra” (W4: 50-67; P134).

“A Quincuncial Projection of the Sphere” (W4: 68-71; P135).

“Note on the Progress of Experiments for comparing a Wave-lenght with a Metre” (W4: 10-11; P136).

“On the method of swinging Pendulums for the determination of Gravity, proposed by M. Faye (W4: 12-20; P137).

The Metaphysical Club Meetings, Johns Hopkins University

October 28, 1879 – first meeting of the Johns Hopkins Metaphysical Club. Meetings will go on until March 3, 1885, totalling 43 meetings, 110 presentations, c.33 principal papers The first paper presented by Peirce is “Questions Concerning certain Faculties Claimed for Man”, on the second meeting of the Club (November 11, 1879). See Pietarinen and Chevalier (2015) for detailed information on the Johns Hopkins Metaphysical Club.

“Read’s Theory of Logic” (W4: 1-3; P148).

“Rood’s Chromatics” (W4: 47-49; P149).

Nota (On the current number of the American Journal of Mathematics) (P150).

“On the projections of the Sphere which preserve the angles” (P151), paper read at the National Academy of Sciences, Washington.

“On the errors of pendulum experiments, and the method of swinging pendulum proposed by Mr. Faye” (P152), paper read at theNational Academy of Sciences, Washington.

“Ghosts in the diffraction spectra” (P153) .

“Comparisons of the meter with wave lengths” (P154).

“(Spectroscopic studies)” (P155).

“Mutual Attraction of Spectral Lines” (P156).

“The Relations of Logic to Philosophy” (P157).

(Preparation of a Star Catalogue) (P159), in Report of the Superintendent of the United States Coast Survey.

“Note on the Economy of Research”, Report of the Superintendent of the United States Coast Survey (W4: 72-78; P160).

“Measurements of Gravity at Initial Stations in America and Europe”, Report of the Superintendent of the United States Coast Survey (W3: 79- 144; P161).

“Spectroscopic Studies” (W4: 4-6; P163).

“(Remarks on the four-color problem)” (P164).


Publishes  “On the Algebra of Logic” on the American Journal of Mathematics, vol. 3, 15-57 (CP 3-154-81; W4: 163-209; parziale in EP1: 200-209; P167).

“Sur la valeur de la pesanteur a Paris” (P 171).

(Comments on Stringham’s paper) (P175), read at the Mathematical Seminar, Johns Hopkins University.

(Remarks on a paper by Marquand) (P176), read at the Metaphysical Club, Johns Hopkins University.

“On Kant’s “Critic of Pure Reason” in the light of Modern Logic” (P177), read at the Metaphysical Club, Johns Hopkins University.

“On the ellipticity of the earth as deduced from pendulum experiments” (P178), read at the National Academy of Science, New York.

“On the Colours of Double Stars” (W4: 161-162; P179).

“A Quincuncial Projection of the Sphere” (P183).


  • “Comparison Between the Yard and Metre by Means of the Reversible Pendulum” (P186), read at the American Association for the Advancement of Science.
  • “On the Logic of Number” (W4: 299-309; P187).
  • Ripubblica il libro del padre “Linear Associative Algebra” (P188) con un estensivo apparato di note e diverse appendici; il lavoro di Peirce è ora pubblicato come W4: 312-327.
  • “Proof that there are only Three Linear Associative Algebras in which Division is an Unambiguous Process” (P194), read at the Mathematical SeminarJohns Hopkins University.
  • (Comments on Mitchell’s paper), read at the Mathematical Seminar, Johns Hopkins University.
  • “On Relations between Sensations” (P196), read at the Metaphysical Club, Johns Hopkins University.
  • (Remarks on Gilman’s paper), read at theMetaphysical Club, Johns Hopkins University.
  • Review of Studies in Deductive Logic, by W. Stanley Jevons (W4: 238-239; P198).
  • “On the progress of pendulum work” (P199).
  • “On the Logic of Number” (P200), read at theNational Academy of Science, Philadelphia.
  • “Width of Mr. Ruthefor’s Rulings” (W4240; P204).


  • “A new Computation of the Compression of the Earth, from Pendulum Experiments” (P210), read at the Scientific Associations, Johns Hopkins University.
  • “A Fallacy of Induction” (P211).
  • (Lettera to Monsieur Faye) (W4: 157160; P215).
  • “On the Irregularities on the Amplitude of Oscillation of Pendulums” (W4: 389-390; P218).
  • “Brief Description of the Algebra of Relatives”, self-published (W4: 328-341; P220).
  • “On a Class of Multiple Algebras” (W4 383-388; P224), read at the Mathematical Society, Johns Hopkins University.
  • “Introductory Lecture on the Study of Logic” (CP 7.59-76; W4: 378-382; EP1 210-214; HP 94’0-44; P225) is Peirce’s presentation of his course at Johns Hopkins University.
  • “On the Relative Forms of Quaternions” (P226), read at the Mathematical Seminar, Johns Hopkins University.
  • “J.S Mill Logic” (P229) read at theMetaphysical Club, Johns Hopkins University.
  • “Remarks on the above paper (di B.I Gilman)” (W4: 345-348; P230), read at the Metaphysical Club, Johns Hopkins University.
  • (Opening remarks for the Metaphysical Club) (P232), read at the Metaphysical Club, Johns Hopkins University.
  • “On the fallacy of induction” (P233), read at the National Academy of Science, Washington.
  • “On the determination of the figure of the earth by the variations of gravity” (P234), read at theNational Academy of Science, New York.
  • “On the logic of relatives” (P235), read at the National Academy of Science, New York.
  • “On Ptolemy’s catalogue of stars”, read at the  National Academy of Science, New York.
  • “Quincuncial Projection of the Sphere” (P238).
  • Lettera a O.H. Mitchell (W4: 394.399; L 294).


  • Starts redacting definitions for the Century Dictionary (published 1889-1901), a work that he will continue until 1891 totalling more than 10.000 definitions.
  • Edits the Studies in Logic by Members of the Johns Hopkins University (P268), containing works on logic by Peirce and his students at Johns Hopkins. Peirce’s contributions include his The Logic of Relatives. His other contributions are: Preface (W4: 406-408); A Theory of Probable Inference (W4: 408-459); Note A: On the Limited Universe of Marks (W4: 450-453); Note B. The Logic of Relatives (W4 453-466).
  • “C.S Peirce. – Irregularidades en las oscilaciones del péndulo” (P241).
  • “A communication by Mr. Peirce” (W4: 467-472; P245), Johns Hopkins circular paper with notes by Sylvester.
  • “Reply to Professor Morris on Life” (P247), respondent at the Metaphysical Club, Johns Hopkins University.
  • “On the Flexure of Pendulum Supports”, report for the United States Coast Survey (W4: 515-528; P253).
  • “On the Deduction of the Ellipticity of the Earth from Pendulum Experiments”, report for the United States Coast Survey (W4: 529-534; P253).
  • “On the Method of Observing the Coincidence of Vibration of Two Pendulums”, report for theUnited States Coast Survey (W4: 535-540; P255).
  • “(Gravity research)”, (W4: 350-355, 360-369, 377; P260) report read at a conference on gravity measurements, Washington.
  • “Six Reason for the Prosecution of Pendulum Experiments” (W4: 356-360; P261).
  • “Opinions Concerning the Conduct of Gravity Work” (W4: 369-376; P262).
  • “Experimental Researches on the Force of Gravity” (P263), in Report of the Superintendent of the United States Coast Survey.
  • “A New Rule for Division in Arithmetic” (W4: 511- 514; P266)


  • Reads at the Metaphysical Club, Johns Hopkins University, the paper “Design and Chance” (MS. 875; W: 4:544-54; EP1: 215-224; P274).
  • “On Weights and Measures” (P270), presented at the Metrological Society meetingat Columbia College, New York.
  • “On the Mode of Representing Negative Quantity in the Logic of Relatives”.
  • “The Logic of Religion”(P275), read at the Metaphysical Club, Johns Hopkins University.
  • “On “The Magnet” a fourteenth century manuscripts of Petrus Peregrinus” (P276), paper read at the Metaphysical Club, Johns Hopkins University.
  • “The Reciprocity Treaty with Spain” (W5: 144- 146; P279).
  • “On Gravitation Survey”(P281), paper read at the National Academy of Science,Newport.
  • “On Minimum Differences of Sensibility” (P282), co-authored with Joseph Jastrow, paper read at the National Academy of ScienceNewport.
  • “On the Algebra of Logic” (P283), paper read at the National Academy of Science, Newport.
  • “Determination of Gravity at Allegheny, Ebensburgh and York, Pa, in 1879 and 1880” (W5:1-23; P290), in Report of the Superintendent of the United States Coast Survey.
  • “The Numerical Measure of the Success of Predictions” (W5: 136-138; P292).
  • “The “Old Stone Mill” at Newport” (W5: 139-143; P293).


  • January. Publishes the very important work “On the Algebra of Logic: A Contribution to the Philosophy of Notation” sull’ American Journal of Mathematics, vol. 7 (January), 180-202 (MSS. 506-508 e 538-39; CP 3.359-403; EP1 223-228; W5: 162-90; P296);
  • “Gravimetric Surveys” (P297), lecture to the Association of Engineers.
  • “The Coast Survey Investigation” (P300).
  • “Connected Pendulums” (P302); lecture hold at the Mathematical SeminaryCornell University.
  • “On Small Differences of Sensations” (co-authored with Joseph Jastrow) is published (W5: 122-135; P303).
  • Writes “An America Plato: Review of Royce’s Religious Aspect of Philosophy” for Popular Science Monthly but is rejected by the editor (MS.1369; parziale CP 8.39-54; W5: 221-34; EP1: 229-242).
  • “The Spanish Treaty Once More” (W5: 147148; P306).
  • Review of The Common Sense of the Exact Sciences, by William Kingdon Clifford (W5: 254-256; P307).
  • Review of The Religion of Philosophy; or, The Unification of Knowledge, by Raymond S. Perrin (W5: 257; P308).


  • “Dr. F.E. Abbot’s Philosophy” (W5: 285- 289; P326).
  • “Review of a Paper on Color Contrast” (P327), paper read at the National Academy of Science, Washington.
  • “Note on a Device for Abbreviating Time Reductions” (W5: 209-316; P334), in Report of the Superintendent of the United States Coast Survey.
  • “On the Influence of a Noddy on the Period of a Pendulum”, in Report of the Superintendent of the United States Coast Survey (W5: 317-318; P335)
  • “On the Effect of Unequal Temperature upon a Reversible Pendulum”, in Report of the Superintendent of the United States Coast Survey (W5: 319-322; P336).
  • (Testimony on the office of weights and measures, and on the gravimetric survey, Coast Survey) (W5: 149- 161; P339).
  • Sends two letters to F. E. Abbot -the first dates from the December 31 of the previous year (W5: 279- 282; L1: 31).
  • December 30, letter to Marquand (W5: 421- 422; L 269).


  • First paper since hie moved to Milford: “Criticism on Phantasms of the Living. An Examination of an Argument of Messrs. Gurney, Myers and Podmore” (W6: 74-81; 352). Edmund Gurney replied with “Remarks on Professor Peirce’s Paper” (O353) starting a “controversy” (Peirce replied with “Mr. Peirce’s Rejoinder”, P354).
  • Publishes “Logical Machines” (P344), in The American Journal of Psychology, vol. 1, 165-170.
  • “(Contribution to the Christian Register symposium on Science and Immortality)” (P348).
  • (Pendulum research) (P356-359).


  • Works at a book project, “A Guess at a Riddle”. The 1885-86 project titled “One, Two, Three” is reworked into it, but “A Guess at a Riddle” remains unfinished. (MS 909; EP1: 245-284; W6: 166-210).
  • “Pendulum Observations” (P369).


  • November, 20. After delays and much pressure, Peirce sends his “Report on Gravity at the Smithsonian, Ann Arbor, Madison and Cornell” (P385). It remained unpublished. It consits of a long typewritten document (MS 1096a) now published in W6: 275-353. See Victor F. Lenzen, “An Unpublished Scientific Monograph by C.S.Peirce”, TCSPS, vol.5 (1969), 5-24, for an account of its content and its relevance.
  • “The Century Dictionary” (P376).
  • Review of Deductive Logic, by St. George Stock (W4: 271-274; P378).
  • “On Sensations of Color” (P379), paper read at the National Academy of Science, Washington.
  • “On Determination of Gravity” (P380), paper read at the National Academy of Science, Washington.


  • March, 23-April, 27. Under the pen name of “Outsider”, Peirce contributes to organise a debate on the thought of Herbert Spencer. The venue is the New York Times. Peirce contribution is the paper “Ousider” Wants more Light. He Cometh After his Critics and Searcheth Them – Spenser’s Standing in Science – His theory of Evolution – “Outsider” is an Inquire, Not an Assillant” (W6: 402- 409; P416). See also (P402).
  • July, 2. Paul Carus asks Peirce to write a paper for the first number of The Monist; Peirce’s  “The Architecture of Theories” however is sent too late, and it will published the year after.
  • Review of The Science of Metrology; or Natural Weights and Measures. A Challenge to the Metric System, by E. Noel (W6: 377- 379; P389).
  • Review of Epitome of the Synthetic Philosophy, by F. Howard Collins, (W6: 401; P390).
  • “Ribot’s Psychology of Attention” (P391).
  • Review of Pure Logic, and Other Minor Works, by Stanley Jevons (P392).
  • Review of Fundamental Problems: The Method of Philosophy as a Systematic Arrangement of Knowledge, by Paul Carus (P393).
  • Review of The Theory of Determination in the Historical Order of its Development. Part I, by Thomas Muir. (P394).
  • Review of Elements of Logic as a Science of Propositions, by E.E. Constance Jones (P395).
  • Review of Locke, by Alexander Campbell Fraser (P396).
  • Note (on the first number of the Monist) (P397).
  • Review of Our Dictionaries, and Other English-Language Topics, by R.O Williams (P398).
  • “Herbert Spencer’s Philosophy. Is it Unscientific and Unsound? – Its Pretensions Attacked and a Demonstration Called for” (W6: 395- 400; P402).
  • February, 1. Schröder resumes his correspondence with Peirce.

1891     .

  • Review of “James Psychology. -1” (P447).
  • Review of “James Psychology. -2” (P448).
  • Review of Vorlesungen über die Algebra der Logik, by Ernst Schröder (P449).
  • Review of Essays, Scientific, Political, and Speculative, by Herbert Spencer (P450).
  • “The Law of “Vis Viva”” (P453).
  • “Abbot against Royce” (P454).
  • Note (a reply to Hoskins on the vis viva debate) (P455).
  • Review of An Introduction to Spherical and Practical Astronomy, by Dascom Greene (P460).
  • “Astronomical Methods of Determining the Curvature of Space” (P461), paper read at the National Academy of Science, New York.
  • “Discussion of a paper by O.N. Rood”, (P462).
  • “The”Pons Asinorum” Again Mr. Peirce sets forth the History of the Phrase from the Times of Duns Scotus’s Followers” (HP: 568-569; P464).


  • Publishes in The Monist 3 out of 5 papers in which his cosmology is contained:
  • – (1891) The Architecture of Theories (CP 6.7-34; EP1: 283-297; P439).
  • – The Doctrine of Necessity Examined (CP6.34-65; EP1:298-311 ; P474).
  • – The Law of Mind (CP 6-102-63; EP1: 312-333 ; P477).
  • – Man’s Glassy Essence (CP 6.238-71; EP1: 334-351; P480).
  • – Evolutionary Love (CP 6.287-317; EP1: 354-371; P521).
  • September, 22 – October, 13. Publishes in Open Court “The Critic of Arguments.1. Exact Thinking” and “The Critic of Arguments. II. The Reader is Introduced to Relatives” (CP 3.404-24; P511).
  • November, 28 -January, 5 1893. Holds 12 lectures at the Lowell Institute a Cambridge on the “History of Science” (MSS. 1274 – 1283; P471):
  • Lecture I, II: Early History of Science (HP: 157-187; MS. 1275);
  • Lecture III: Egyptian Science (HP: 188-200; MS. 1276);
  • Lecture V: Further Ancient Science – Chaldean and Greek Astronomy (HP: 201-215; MS. 1277);
  • Lecture VI: Pythagoras – German Historical Criticism (HP: 216-226; MS. 1278);
  • Lecture VIII: Archimedes (HP: 227-238; MS. 1279);
  • Lecture IX: Post-Hellenic to fiftheen Century (HP: 239-257);
  • Lecture X: Copernicus (Copernicus) (HP: 258-265; MS. 1281 e 1285);
  • Lecture XI: Part One: Galileo (HP: 266-279 ; MS. 1282);
  • Lecture XI: Part Two: Galileo (HP: 180-286; MS. 1283).
  • “Synechism” (P470), paper read at the Graduate Philosophical Society of Harvard University.  MS. 955 contains notes from this presentation.
  • “The Comist Calendar” (P482).
  • “Science in America” (P484; P489).
  • “Non-Euclidean Geometry” (P485).
  • Review of The Man of Genius, by Cesare Lombroso (P487).
  • “Is Induction an Inference?” (P490).
  • Review of A Treatise on the Geometry of the Circle, and some Extensions to Conic Sections by the method of Reciprocation, by William McClelland (P495).
  • Review of Mathematical Recreations, and Problems of Past and Present Times, by W.W. Rouse Ball (P498).
  • Review of Moral Teachings of Science, by Arabella B. Buckley (P499).
  • Review of The Origin of Metallic Currency and Weight Standards, by William Ridgeway (P500).
  • Review of The Grammar of Science, by Karl Pearson (P501).
  • Review of The Province of Expression: A search for principles underlying adequate methods of developing Dramatic and Oratoric Delivery, by S.S. Curry (P502).
  • Review of Dynamics of Rotation: An Elementary Introduction to Rigid Dynamic, by A.M. Worthington (P503).
  • Review of The Philosophy of Spinoza, by George Stuart Fullerton (P504).
  • Review of Dreams of the Dead, by Edward Stanton (P505).
  • “The Boston Public Library” (P506).
  • Review of Distinctions and the Criticism of Belief, by Alfred Sidwick (P507).
  • Review of Logarithmic and Other Mathematical Tables, by William J. Hussey (P508).
  • “Pytaghorics” (P510).
  • “Dmesis” (P512).
  • “Napoleon Intime”(519).
  • “Napoleon Intime. Second Article” (P520).


  • The publication of Petrus Peregrinus on the Loadstone: Latin Text, English Version, and Notes. With an introductory History of the Experimental Science in the Middle Ages, By C.S Peirce is announced, but eventually only the prospect is published in October (P551) and now edited in HP: 58-64.
  • The publication of “Search for a Method” (MS. 407) is announced by publisher Open Court, but no publication follows.
  • 1893-1894. Peirce works at his “Grand Logic” within a book titled “How to Reason: A Critik of Arguments” (MS 397- 423), which however is not published. The second chapter “What Is a Sign?” (originally conceived as the first chapter of “The Art of Reasoning””) is now published in EP2: 4-10; CP 2.281, 285 e 297-302 in part (see MS. 404).
  • Peirce’s Principles of Philosophy: Or Logic, Physics and Psychich, Considered as a Unity, In the Light of the Nineteenth Century (P552) in 12 volumes (Henry Holt Co.) is announced but never completed.
  • May, 4. Peirce sendes the short but important paper “Immortality in the Light of Synechism” to The Open Court, but the paper is considered also for The Monist. Because of a misunderstanding wiht the editor of both journals, Paul Carus, Peirce will not be published (EP2: 1-3; CP 7.565-78; MS. 886).
  • Publishes in The Monist, vol. 3, 526-570, the paper “Reply to the Necessitarians” (P525).
  • Review of The Science of Mechanics, by Ernst Mach (P527), under the pen name of “Kappa kappa”.
  • Review of A Treatise on the Mathematical Theory of Elasticity, by A.E.H Love (P528).
  • Review of The Meaning and Method of Life: A Search for Religion in Biology, by George M. Gloud (P530).
  • “Hale’s New England Boyhood” (P531).
  • Review of An Elementary Treatise of Pure Geometry, di John Wellesley Russell. An Elementary Treatise on Modern Pure Geometry, by R. Lachlan (P 532).
  • Review of Pioneers of Science, by Oliver Lodge (P533).
  • “Was Copernicus a German?” (P535).
  • “Mach’s Science of Mechanics” (P536).
  • Review of Negative Beneficence and Positive Beneficence. Being Parts V. and VI. of the Principles of Ethics, by Herbert Spencer (P537).
  • Review of Personal Recollections of Werner von Siemens, by W.C. Coupland (P 538).
  • “Conundrum” (P540).
  • “Ritchie’s Darwin and Hegel” (P541).
  • “Leland’s Memoirs” (P542).
  • Review of  L’Ennemi del Lois, by Maurice Barres (P544).
  • “The Marriage of Religion and Science” (P545).
  • “Cogito Ergo Sum” (P547).
  • “What is Christian Faith?” (P548).


  • “Rough notes on geometry. Constitution of real space” (P553).
  • Review of  Utility of Quaternions in Physics, by A.C. Mc Aulay (P557).
  • Note (su Peirce’s Principles of Philosophy and his edition On the Loadstone) (P558).
  • Note (su Langley’s “The Internal Work of the Wind”) (P559; 563).
  • “Huxley’s Essays” (P560).
  • “Scott Familiar Letters” (P561).
  • “Early Magnetical Science. I” (P562); “Early Magnetical Science. II” (P564).
  • “Funk’s Standard Dictionary” (P565).
  • “Mathematical Functions” (P566).
  • “Lockyer’s Dawn of Astronomy” (P567).
  • Review of  The Monism of Man, di David Allyn Gorton (P568); Genetic Philosophy, by David Jayne Hill.
  • Review of  An Elementary Treatise on Fourier’s Series and Spherical and Ellipsoidal Harmonic, di William Elwood Byerly (P569); Lectures on Mathematics, delivered in August and September, 1893, at Evanston III, by Felix Klein.
  • “Cajor’s History of Mathematics” (P570).
  • Review of  Total Eclipses of the Sun, by Mabel Loomis Tood (P571).
  • Review of  New Light from the Great Pyramid, by Albert Ross Parsons (P572).
  • Review of  Johnson’s Universal Cyclopedia: A New and Enlarged Edition. Charles Kendall Adams, Editor (P573).
  • Review of  Review of Basal Concepts in Philosophy, by Alexander T. Ormond (P574).
  • Review of  The Animal as a Machine and a Prime Mover and The Law of Energetic (P575).
  • “Alchemy and Chemistry” (P576).
  • “Helmholtz” (P577).
  • “Four Histories of Philosophy. 1.” (578); “Four Histories of Philosophy. 2.” (P579).
  • “Spinoza’s Etchic” (P582).
  • “Hallucinations” (P583).
  • Review of Modern Scientific Whist, by C.D.P Hamilton (P586).
  • “Descarts and His Works” (P587).
  • “(Exhibition of the arithmetics of Rollandus)” (P589), read at the New York Mathematical Society.
  • “Mathematics Their Theme” (P590).
  • Review of Essays in Historical Chemistry”, by T. E Thorpe (P580).
  • “How to Reason: A Critik of Arguments” is rejected both by Macmillan and by Open Court.


  • “Prof. Arthur Cayley” (P592).
  • Review of Logic, by Dr. Christoph Igwart. Second Edition (P596).
  • Review of Philosophy of Mind: An Essay in the Metaphysics of Psychology, by GeorgeTrumbull Ladd (P597).
  • Review of Comte, Mill and Spencer; An Outline of Philosophy, by John Watson (P599).
  • Review of Herbart and the Herbartarians, by Charles DeGarno (P600).
  • “Some Studies of Reasoning” (P601).
  • Review of The Source and Mode of Solar Energy Throughout the Universe, by I. W. Heysinger (P602).
  • Review of Mental Development in the Child and the Race: Methods and Processes, by James Mark Baldwin (P603).
  • Review of Studies in the Evolutionary Psychology of Feeling, by Hiram M. Stanley (P604).
  • Review of The Psychology of Number, and its Applications to Methods of Teaching Arithmetic, by James A. Mclellan and John Dewey (P605).
  • “Acetylene and Alcohol”(P608).
  • His New Elements of Mathematics is rejected by Open Court; the surviving draft, MS. 165, is published as NEM 2: 1-232.
  • Scrive un solo capitolo di un opera intitolata “Short Logic” per la Ginn & Co. (CP parziale 2.282, 286-91, 195-96, 435-44 e 7.555-58; EP2: 11-26; MS. 595).


  • October. Publishes “The Regenerated Logic” (The Monist, 7, 19-40- Now CP 3.425-55; P620).
  • Review of A History of the Warfare of Science with Theology in Christendom, by Andrew Dickson (P611).
  • Review of “Light and Electricity According to Maxwell and Hertz”, by M. Poincaré (P613).
  • Review of “Photographic Photometry”, by M.J. Janssen (P614).
  • Review of “Four Days’s Observations at the Summit of the Mont Blanc”, by M.J. Janssen (P615).
  • Translation of Genius and Degeneration, by William Hirsh (P616).
  • “Number: A Study of Methods of Exact Philosophical Thought” (P618).
  • “Benjamin’s History of Electricity” (P621).
  • Review of Science and Art Drawing, by Humphrey Spanton (P623).
  • Review of Molecules and the Molecular Theory of Matter, by A.D. Risteen (P625).
  • Review of Mind and Motion, and Monism, by George John Romanes (P626).
  • Review of Algebra und Logik der Relative, der Vorlesungen über die Algebra der Logik, by Dr. Ernst Schröder (P627).
  • Review of The Number Concept; Its Origin and Development, by Levi Leonard Conant (P628).
  • “Kulpe’s Outline of Psychology” (P629).
  • Review of Elements of the Theory of Functions of a Complex Variable, with especial reference to the Methods of Riemann, by Dr. H. Durege (P630).
  • “On the Logic of Quantity” (P631); paper read in absentia at the National Academy of Science, Washington. cfr. (MS. 14-22).
  • “A Graphical Method of Logic” (P632), read at the National Academy of Science,New York.
  • “Mathematical Infinity” (P633), read at the National Academy of Science, New York.


  • January. Publishes “The Logic of Relatives,” which engages with Schröder’s work on the logic of relatives (The Monist,. 7, 161-217. Now in CP 3.456-552; P637).
  • “James Joseph Sylvester” (P635).
  • Note in memory of J.J Sylvester) (P639).
  • Review of Studies in Psychical Research, by Frank Podmore (P640).
  • Review of The Principles of Chemistry, by D. Mendeleef (P641).
  • Note on Boethius, The Consolation of Philosophy (P642).
  • Nota on Perry’s Calculus for Engineers (P644).
  • Review of The Conception of God, by Josiah Royce (P645).


  • February, 10 – March 7. Holds a series of conferences at Cambridge titled “Reasoning and the Logic of Things” (Now published in Reasoning and the Logic of Things: The Cambridge Conferences Lectures of 1898.Ed. Kenneth L. Ketner. Cambridge: Harvard University Press, 1992).
  •  The History of Science announced by G. P Putnam (publisher) but was never completed.
  • “The Logic of Mathematics in Relation to Education” (P653).
  • Review of Some Unrecognized Laws of Nature: An Inquiry into the Causes of Physical Phenomena, with Special Reference to Gravitation, di Ignatius Singer and Lewis H. Berens (P657).
  • Review of Social and Ethical Interpretations in Mental Development, by James Mark Baldwin (P658).
  • Review of Memory and its Cultivation, by Edridge Green (P659).
  • Review of Astronomy, by A. Agnes M. Clerke, A. Fowler e J. Elland Gore (P660).
  • Review of Dynamic Idealism: An Elementary Course in the Metaphysics of Psychology, by Alfred H. Loyid; Practical Idealism, by William De Witt Hyde (P661).
  • Note (on Reye’s Geometrie der Lage) (P662)
  • Review of The New Psychology, by E.W. Scripture (P663).
  • “The Psychology of Suggestion” (P664).
  • Review of The Wonderful CenturyIts Success and its Failures, by Alfred Russell Wallace (P665).
  • Note on Kerr’s Wireless Telegraphy (P666).
  • “Baldwin’s Story of the Mind” (P667).
  • Recensione de Logic, Deductive and Inductive, di Carveth Read (P668).
  • Note on Lambert’s Differential and Integral Calculus for Technical Schools and Colleges (P669).
  • Review of The Story of Marco Polo, by Noah Brooks (P670).
  • Review of Radiation: An Elementary Treatise on Electromagnetic Radiation and on Röntgen and Cathode Rays, by Francis Hydman (P671).
  • “Darwin’s Tides” (P672).
  • “Note on the Age of Basil Valentine” (P674).


  • “Death of Prof. Bunsen” (P679).
  • Review of Matter, Energy, Force, and Works, by Silas W. Holman (P682).
  • Review of Leibniz: The Monadology and Other Philosophical Writings, translated by Robert Latta (P683).
  • Note on Kepler’s Somnium (P684).
  • Review of A History of Physics in its Elementary Branches, by Florian Cajori (P685).
  • Review of My Inner Life, by John Bettie Crozier (P686).
  • “Galileo’s Reasoning” (P688).
  • Review of The Gambling World, by Rouge et Noir; The History of Gambling in England (P689).
  • Review of Outlines of Industrial Chemistry, by Frank Hall Thorp (P690).
  • Review of Stars and Telescopes: A Hand-Book of Popular Astronomy, Founded on the Ninth Edition of Lynn’s Celestial Motions, by David P. Todd (P691).
  • “Marshall’s Instinct and Reason” (P692).
  • Review of An Introduction to the Theory of Analytic Functions, by J. Harkness e F. Morley (P693).
  • Review of Old Clocks and their Makers, by Frank J. Britten (P694).
  • “Leibniz Rewritten” (P695).
  • Review of Through nature to God, by John Fiske (P696).
  • Note on the fifth edition of the Works of Berkeley (P697).
  • Review of From Comte to Benjamin Kidd, by Robert Mackintosh; Better-World Philosophy, by J. Howard Moore (P698).
  • Review of Mathematical Essays and Recreations, by Hermann Shubert; The Study and Difficulties of Mathematics, by August De Morgan (P699).
  • Review of Observational Geometry, by William T. Campbell (P700).
  • Review of The Boy’s Book of Invention: Stories of the Wonders of Modern Science, by Ray Stannard (P701).
  • “Ford’s Franklin” (P702).
  • Review of The life of James Dwight Dana, Scientific Explorer, Mineralogist, Geologist, Zoologist, Professor in Yale University, by Daniel C. Gilman (P703).
  • “The Map-coloring Problem” (P704).
  • “Professore Bunsen” (P705).


  • Review of The Spiritual Life, di George A. Coe; Introduction to Ethics, by Frank Thilly (P709).
  • Note on Lewis’ Treatise on Crystallography (P713).
  • Note on Pick’s Lectures on Memory Culture (P714).
  • Review of A History of Wireless Telegraphy,1838.1899, by J.J. Fahie (P716).
  • Review of Le Mécanisme de la vie moderne, by G. d’Avenel (P717).
  • Note on Carus’ Kant and Spencer (P718).
  • “Lyon Palyfair” (P719).
  • Note on Thorp’s Outlines of Industrial Chemistry, revised edition) (P720).
  • Note on Ripper’s Stream-Engine Theory and Practice (P721).
  • Note on Atkinson’s Power Transmitted by Electricity (P722).
  • Note on Gay and Yeaman’s An introduction to the Study of Central Station Electricity Supply (P723).
  • Note on Watson’s A Text-Book of Physics (P724).
  • Note on Pearson’s Grammar of Science, second edition (P725).
  • Note on Hertz’ Principles of Mechanics Presented in a New Form (P726).
  • Review of The Teaching of Elementary Mathematics, by David Eugene Smith (P727).
  • Review of The World and the Individual, by Josiah Royce (P727).
  • “Grosse teste” (729).
  • Review of History of Ancient Philosophy, by W. Windelband (P731).
  • Note on Bottone’s Wireless Telegraphy and Hertzian Waves (P732).
  • Review of A Short History of Free Thought, Ancient and Modern, by John M. Robertson (P735).
  • Note on Sedgefield’s edizione delle Consolations by Boezio (P736).
  • Review of Theory of Differential Equations, by Andrew Russell Forsyth (P737).
  • Review of A History of Modern Philosophy: A Sketch of the History of Philosophy from the Close of Renaissance to Our Own Day, by Harald Höffding (P738).
  • Review of The Kinetic Theory of Gases: Elementary Treatise with Matheamtical Appendices, by Emil Meyer (P739).
  • Review of The Theory of Electrolytic Dissociation, and Some of its Applications, by Harry C. Jones (P741).
  • Note on the mathematical writings of Perry (P742).
  • Review of Bordeaux and Its Wines, Classed by Order of Merits, (P743).
  • Review of Acetylene, by Vivian B-Lewis (P744).
  • Review of Joseph Glanvill, by Ferris Greenslet (P745).
  • Review of A Brief History of Mathematics, by Dr. Karl Fink (P746).
  • Review of The Individual: A Study of Life and Death, by Nathaniel Southgate Shaler (P747).
  • Review of The Progress of Invention in the Nineteenth Century, by Henry Smith Williams (P748).
  • Review of The Story of Nineteenth Century Science, by Henry Smith Williams (P749).
  • “Infinitesimals” (P750).
  • Review of Clark University, 1888-1899. Decennial Celebretion, published by Clark University Press (P751).


  • Starts collaborating with the Dictionary of Philosophy and Psychology edited by J.M. Baldwin; Peirce’s entries in 1901 go from da P761 a P778.
  • November, 12-14. Reads “On the Logic of Research into Ancient History” at the National Academy of Sciences in Philadelphia (Cfr. MSS. 690-691 e 1344).
  • Review of Thomas Hariot, the Mathematician, the Philosopher, and the Scholar, by Henry Stavens (P752).
  • Translation of “On the Sense of Smell in Birds”, by N. Xavier Raspail (P753).
  • Translation of “The Sculptures of Santa lucia Cozumahualpa, Gautemala, in the Hamburg Ethnological Museum”, by Herman Strebel (P754).
  • Translation of  “The Progress of Aeronautics, by M. Janssen (P 755).
  • Translation of “The Growth of Biology in the Nineteenth Century, by Oscar Hertiwg (P756).
  • Translation of “Life in the Ocean”, by Karls Brandt (P757).
  • Translation of “The Breading of the Arctic Fox”, by Henry de Varigny (P758).
  • Translation of “On the Ancient Desemers or Stelyards, by Herman Sokeland (P759).
  • “The Century’s Great men in Science” (see P760, P779 and P801).
  • “Wallance Studies” (P783).
  • “William Hershel” (P783).
  • Review of Webster’s International Dictionary of the English Language, ed. by W.T. Harris (P784).
  • “Shaftesbury” (P785).
  • Note on Bowley’s Elements of Statistics (P786).
  • Review of By land and Sea, by Rev. John N. Bacon (P787).
  • Review of Essays in Illustrations of the Action of Astral Gravitation in Natural Phenomena, by William Leighton Jordan (P788).
  • Review of Le Vocabulaire Philosophique, by Edmon Goblot (P789).
  • Note on Turner’s Knowledge, Belief, and Certitude (P790).
  • “Berkeley’s Works” (P791).
  • Review of Bibliotics; or the Study of Documents, Determination of the Individual Character of Hand-writing, And Detection of Fraud and Forgery, by Persifor Frazer (P792).
  • Review of The Philosophy of Religion in England and America, by Alfred Caldecott (P793).
  • “Some Physical Books” (794).
  • “Maher’s Psychology” (P795).
  • Review of Ethics: Descriptive and Explanatory, by Sidney Edward Mezes (P796).
  • “The National Academy at Philadelphia” (P797).
  • Note on Wall’s Concise French Grammar (P798).
  • Review of Practical X-ray Work, di (P799).
  • “Pearson’s Grammar of Science. Annotations on the First Three Chapters” (CP 8132-52; EP2: 57-66; P802).
  • “Campanus” (803).
  • Drafts a paper on laws of nature and Hume’s argument against miracles (EP2: 67-74), upon invitation from Samuel P. Langley, secretary of the Smithsonian Institution.
  • “On the Logic of Drawing History from Ancient Documents, Especially from Testimonies” (CP 7.164-231; HP 2:705-62; EP2 parziale: 75-114; MS 690).


  • Writes 168 entries for the Baldwin Dictionary (P806-P974).
  • 1901-02. Completes 4 chapters of the Minute Logic. Chapter 2, “On Science and Natural Classes”, is published in CP 1.203-37; EP2: 115-132; dal MS. 427).
  • His application for a Carnegie-Mellon scholarship is rejected. The application (L 75) has been analytically reconstructed by Joseph Randsdell and is available on the PEP website. A critical edition is published in HP 1022.
  • Translation of “The History of Chronophotography”, by Dr. J. Marey (P805); MSS. 1414-1415 contains Peirce’s annotations.
  • “Pasteur” (P975).
  • “Gidding’s Inductive Sociology” (P976).
  • “The National Academy of Sciences” (P977).
  • Review of The Story of the Vine, by Edward R. Emerson (P978).
  • Note on Delta’s Charades (P979).
  • Review of A Study of The Ethics of Spinoza, by Harold H. Joachim (P980).
  • Note on Atkinson’s Electrical and Magnetical Calculations (P981).
  • Note on Forsyth’s Theory of Differential Equations, vol.4 (P982).
  • Review of Studies in Physiological Chemistry, ed. by R.H. Chitteden; Qualitative Chemical Analysis, by Albert B. Prescott e Otis Johnson; Victor von Richter’s Organic Chemistry, ed. by Edgar F. Smith; The Elements of Physical Chemistry, by Harry C. Jones (P).
  • “Royce’s World and the Individual” (P984).
  • “Thorpe’s Essays in Historical Chemistry” (P986).
  • “Paulsen’s Kant” (P987).
  • Review of The Principle of Logic, by Herbert Austin Aikins (P988).
  • Review of The Theory of Optics, by Paul Drude (P989).
  • “Aviation” (P990).
  • Review of  The Origin and Significance of Hegel’s Logic: A General introduction to Hegel’s System, by J.B. Baillie (P991).
  • Review of  The Theory of Differential Equations. Part III (vol. IV): Ordinary Linear Equations, by Andrew Russell Forsyth (P992).
  • “Ellwanger’s Pleasures of the Table” (P993).
  • Review of  Sundials and Roses of Yesterday, by Alice Morse Earl (P994).
  • “The Classification of Sciences”, read at the National Academy of Science,Washington.
  • “(Majority report, committee on Weight, Measure, and Coinage, National Academy of Science) co-signed by Peirce.
  • “The Color System”; read at the National Academy of Science, Washington.
  • “The Postulates of Geometry”, read at the National Academy of Science, Washington.


  • Marzo, 26 – Maggio, 17. Harvard lectures with the title “Pragmatism as a Principle and Method of Right Thinking”, the first seven at the philosophy department, the eighth at the department of mathematics (P1004).
  • March, 26 (The Maxim of Pragmatism) (CP 5.14-40; HL 10-21; EP2: 133-144; MS. 301);
  • April, 2 On Phenomenology (CP in parte 5.41-56, 59-65 ; HL 150-65; EP2: 145-159; MS. 305-306);
  • April, 9 The Categories Defended (CP in parte 5.66-81, 88-92; HL 167-88; EP2: 160178; MS. 308);
  • April, 16 The Seven Systems of Metaphysics (CP 5.77n, 93-111, 114-18, 1.314-16, 5.119, 111-13, 57-58; HL 189-203; EP2: 179-195; MS. 309);
  • April, 30 The Three Normative Sciences (CP 5.120-50; HL 205-20; EP2: 196-207; MS. 312);
  • May, 7 The Nature of Meaning (CP in parte 5.151-79; HL 221-39; MSS. 314, 316);
  • May, 14 Pragmatism as the Logic of Abduction (CP in parte 5.180-212; HL 241-56; EP2: 226-241; MS. 315).
  • October. Publishes “Syllabus of Certain Topics of Logic”. Originally, it should have included all six lectures; eventually, only the first two and part of the sixth one are printed (P1035).
  • An Outline Classification of the Sciences (CP 1.180-202; EP2: 258-262; MS. 478);
  • The Ethics of Terminology (CP 2.219-26; EP2: 263-266; MS. 478);
  • Sundry Logical Conceptions (CP in parte 2.274-77, 238-84, 292-94, e 300-31; EP2: 267-288; MS. 478);
  • Nomenclature and Divisions of Dyadic Relations (CP 3.571-608; MS. 539);
  • Nomenclature and Divisions of Triadic Relations, as Far as They Are Determined (CP 2.233-72; EP 2: 289-299; MS. 540);
  • Existential Graphs: The Conventions (CP4.394-417; MS. 508).
  • November 23 – December, 17. Lowell Lectures on “Some Topics of Logic Bearing on Questions Now Vexed”:
  • November 23, What Makes a Reasoning Sound? (CP only in part 1.591-610, 1.611; EP2: 242-257; MSS 448-449);
  • November 27, A System of Diagrams fro Studying Logical Relations (MSS. 455-456);
  • November 30, The Three Universal Categories and Their Utility (MSS. 457-466);
  • December 3, Expositions of the System of Diagrams (MS. 472);
  • December 7, The Doctrine of Multitude, Infinity and Continuity (MSS. 468-471);
  • December 10, What is Chance? (MS. 472);
  • December 14, Induction as Doing, Not Mere Cogitation (MSS. 473-474);
  • December 17, How to Theorize (MSS. 475-476). Cfr anche MSS. 477-478.
  • Review of Euclid: His Life and System, by Thomas Smith (P1006).
  • Note on The Physical Papers of Henry Augustus Rowland) (P1007).
  • “A Corrections” (P1009).
  • Note on Fiske’s Cosmic Philosophy (P1010).
  • “The National Academy Meeting” (P1011).
  • Note on Mellor’s Higher Mathematics for Students of Chemistry and Physics (P1012).
  • “Hegel’s Logic Interpreted” (P1013).
  • Note on Whittaker’s A Course of Modern Analysis (P1014).
  • Review of Personal Idealism: Philosophical Essays by Eight Members of the University of Oxford, ed. by Henry Cecil Sturt (P1015).
  • Review of Dictionary of Philosophy and Psychology, ed. by James Mark Baldwin (P1016).
  • Note on Kant’s Prolegomena to any Future Metaphysics, ed. by Paul Carus) (P1017).
  • Review of  Studies in the Cartesian Philosophy, by Norman Smith (P 1018).
  • Review of  Inorganic Chemistry: With the Elements of Physical and Theoretical Chemistry, by J.I.D. Hinds (P1019).
  • “Clerkse’s Astrophysics” (P1020).
  • Review of  Light Waves and Their Uses, by A.A Michelson; Waves, Air, and Ether, by J.A. Fleming (P1021).
  • Note on Cohn’s Test and Reagents (P1022), on Krauch’s The Testing of Chemical Reagents for Purity (P1023) on Perrine’s Conductors for Electrical Distribution (P1024).
  • “British and American Science” (P1026).
  • Review of What is Meaning?, by V. Welby (P1028).
  • “Practical Application of the Theory of Functions” (P1030).
  • “Francis Ellingwood Abbot” (P1031).
  • Translation of “On Absorption and Emission of Air and Its ingredients for Light of Wave-Lenghts from 250pp to 100pp”, by Victor Shumann (P1034).
  • Starts his corresponedence with Lady Victoria Welby.


  • “French Academy of Sciences” (1038).
  • Note on four volumes on electricity: Walmsley, Foster & Porter, Barnett, Parr (P1041).
  • “Fahie’s Galileo” (P1042).
  • Note on Hilton’s Mathematical Crystallography and the Theory of Groups of Movements (P 1043).
  • Note on Campbell’s Introductory Treatise on Lie’s Theory of Finite Continuous Transformation Groups (P1044).
  • Note on Woodbridge’s The Philosophy of Hobbes in Extracts and Notes collected from his Writings (P1045).
  • “The Metric Fallacy” (1046).
  • Note on van’t Hoff’s Physical Chemistry in the Service of the Sciences (P1047).
  • Review of The Reminiscences of an Astronomer, by Simon Newcomb (P1048).
  • Review of  Lectures on the Logic of Arithmetic, by M.E. Boole; Elements of the Theory of Integers (P1049).
  • “The National Academy Meeting” (P1050).
  • “Comte’s Philosophy” (P1051).
  • Note on Jones’s Notes on Analytical Geometry (P1052).
  • Note on Ryder’s Electric Traction (P1053).
  • Note on Hawkins and Wallis’s The Dynamo (P1054).
  • “Turner’s history of Philosophy” (P1055).
  • Review of Spinoza’s Political and Ethical Philosophy, by Robert a Duff (P1056).
  • Review of Notes on the Composition of Scientific Papers, by T. Clifford. Allbutt (P1057).
  • Note on Buchanan’s Mathematical Theory of Eclipses (P1058).
  • Review of  The Collected Mathematical Papers of James Joseph Sylvester (P1059).
  • “Logical Lights” (P1060).
  • Review of  Outlines of Psychology, by Josiah Royce (P1061).
  • Note on Mendeleef’s An Attempt Towards a Chemical Conception of the Ether (P1062).
  • Note on Murray’s Introduction to Psychology (P1063).
  • Note on Cajori’s Introduction to the Modern Theory of Equations (P1064).
  • Review of  Experimental Psychology and its Bearing upon Culture, by George Malcolm Stratton (P1065).
  • “The National Academy in New York” (P1066).
  • Note on Olsen’s Text Book of Quantitative Chemical Analysis (P1067).
  • “Notes on the Simplest Possible Branch of Mathematics”(P1069), read at the National Academy of Science, Washington.
  • “On Topical Geometry” (P1070), read at the National Academy of Science, New York.
  • “(Letters on a proof of the distributive principle)” (P1071).


  • April. Starts publishing on The Monist (vol. 15 (April), pp. 161-181; vol 15. (Oct.), pp. 481-499; Vol. 16 (Oct), pp. 492-546) 2 of his 3 essays on his “pragmaticism series” (he planned 6 papers but only 3 were published). They are:
  • – What Pragmatism Is (CP 5.4111-37; EP2: 332-345; P1078);
  • – Issues of Pragmaticism (CP 5.438-63; EP2: 346- 359; P1080);
  • (1906) Prolegomena to an Apology of Pragmaticism (P 1128).
  • Review of  The Preparation of the Child for Science, by M.E. Boole (P1082).
  • “Royce’s Spencer” (P1083).
  • Review of The Becquerel and the Properties of Radium, by Hon. R.J. Strutt (P1084).
  • Review of An introduction to the Theory of Optics, by Arthur Schuster (P1085).
  • Review of Modern Practical Chemistry, by Mullineaux Walmsley (P1086).
  • Note on Laurent’s Les Écrivains Scientifiques (P1088).
  • Review of The Phase Rule and its Applications, by Alex. Findlay (P1089).
  • “The National Academy of Sciences” (P1090).
  • Review of Philosophy as Scientia Scientarium, and a History of the Classification of Sciences, by Robert Flint; A Syllabus of Certain Topics of Logic, by Peirce himself (P1091).
  • Note on Garcin’s N-Rays (P1092).
  • Note on Mendeleef’s Principles of Chemistry, third edition (P1093).
  • Review of Scientific Fact and Metaphysical Reality, by Robert Brandom Alrnold (P1094).
  • Note on Santayana’s Life of Reasons, or the Phases of Human Progress, v. 1, 2 (P1895).
  • Note on Freund’s The Study of Chemical Composition (P 1096).
  • Review of James Watt, by Andrew Carneige (P1097).
  • Note on Bacon’s Balloons, Airships, and Flying Machines (P1098).
  • Note on Hamson’s Radium Explained (P1099).
  • Review of Sociological Papers, by Edward Alsworth Ross (P110).
  • “Wund’s Principles of Physiological Psychology ” (CP 8.196-204; P1101).
  • Note on James’ paper apperared in Archives de Psychologie) (P1101).
  • Review of Nos Enfants au Collège , by Maurice de Fleury (P1103).
  • Review of A Treatise on Chemistry, by Sir H.E. Roscoe e C. Shorlemmer (P1104).
  • Review of La Nature et la vie, by Henry de Varigny (P1105).
  • Note on The Collected Mathematical Works of George William Hill (P1106).
  • Nota on Shield’s Philosophia Ultima (P1107).
  • Note on Fine’s College Algebra (P1108).
  • Note on Wiart’s La Cité Ardente (P1109).
  • “The National Academy of Science at New Haven” (P1110).
  • “Gosse’s Sir Thomas Brown” (P1111).
  • “The Relation of Betweenness and Royce’s O-collections” (P1112)


  • “Mr. Peterson’s Proposed Discussion” (P1124); with a follow up “Erratum” (P1125).
  • Review of Foundations of Sociology, by Edward Asworth Ross (P1126).
  • Review of Radio-Activity, by E. Rutherford (P1129).
  • “Alfred Russel Wallace” (P1130).
  • “Haldane’s Descartes” (1131).
  • “Meeting of the National Academy of Sciences” (P1132)
  • Review of Congress of Arts and Sciences, Universal Exposition, St. Luis 1904, vol 1, ed. by Howard J. Rogers (P1133).
  • Review of The Dynamics of Living Matter, by Jaques Loeb; Chemistry of the Proteids, by Gustav Mann (P1134).
  • Review of The Life and Experiences of Sir Henry Enfield Roscoe, autobiography (P1135).
  • Note on Clerke’s System of the Stars (P1136).
  • “Aristotle’s Ethics” (P1137).
  • Review of An Introduction to Logic, by Horace William Brindley Joseph (P1138).
  • Review of Sidelings on Astronomy and Kindred Fields of Popular Science: Essays and Addresses, by Simon Newcomb (P1139).
  • “Recent Developments of Existential Graphs and their Consequences for Logic”, read at the National Academy of Science, Washington.
  • “Phaneroscopy, or Natural History of Signs, Relations, Categories, etc.: A method of investigating the subject expounded and Illustrated”, read at the National Academy of Science, Boston.
  • “Men of Science in Session” (P1146).
  • “Mars as a Place to Inhabit” (1147).


  • Aprile, 8-12-13. Delivers three lectures at the Harvard Philosophy Club on “Logical Methodeutic”; the first two are titled: “1. Retroduction, or the Framing of Hypothesis” and “II Induction, or the Experimental Method” (MS 754; P1150).
  • Letters to The Nation and Atlantic Monthly on pragmaticism (R 318).
  • Review of The Scientific Papers of Williard Gibbs (P1153).
  • Review of A History of Chemistry, by Ernest von Meyer (P1154).
  • Review of Thought and Things: A Study of the Development and Meaning of Thought, or Genetic Logic, by James Mark Baldwin (P155).
  • Note on Stickney’s Organized Democracy (P1156).
  • Review of the Collected Mathematical Works of George William Hill  (P1157).
  • “The Work of George W. Hill” Peirce’s reply to a letter from Newcomb (P1159).
  • “Lord Kelvin” (P1160).
  • Obituary of Lord Kelvin (P1161).


  • October. Publishes on the Hibbert Journal “A Neglected Argument for the Reality of God,” and original argument in favour of the existence of God (CP 6.452-91; EP2: 434450; P1166).
  • April, 18. Publishes the first paper of his last series of essays on The Monist, under the title “Some Amazing Mazes”; in the same year: “Some Amazing Mazes: The First Curiosity” (P1171) and “Some Amazing Mazes Explanation of Curiosity the First” (P1175).
  • Publishes his last review of Thought and Things: A Study of the Development and Meaning of Thought, or Genetic Logic, by James Mark Baldwin (P1176).
  • Obituary of Oliver Wolcott Gibbs (1177).
  • “A Letter from Mr. Peirce” (P1178).


  • February, writes on his logical notebook (MS. 339) the first truth table for a three-values logic.
  • “The Fortieth Anniversary of The Nation” (P1190).
  • Publishes the last paper of his life: “Some Amazing Mazes: A Second Curiosity” (P1193).
  • (1909-1910) Plans a work titled: “Essays on the Reasoning of Science” (MS. 334).


  • “(Portion of a letter on non-Aristotelian logic)” (P1206-1207).


  • Wirtes the contribution “A Sketch of Logical Critics” for a volume in honour of Lady Welby (not published).
  • Writes “A Method of Computation”; his paper is read at theNational Academy of Science(P1214).
  • “The reasons of reasoning, or grounds of inferring,” paper read at the National Academy of Science; it is the last time that Peirce presents his work in public.