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  Peirce, C. S. (1885). Notes on the Categories [R]. MS [R] 895; MS [W] 545. | Manuscript |  | 
          
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  Peirce, C. S. (1885). On the Algebra of Logic: A Contribution to the Philosophy of Notation. American Journal of Mathematics, 7 , 180-202. | Article in Journal |  | 
          
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  Peirce, C. S. (1885). One, Two, Three: Fundamental Categories of Thought and of Nature. MS [R] 901. | Manuscript |  | 
          
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  Peirce, C. S. (1886). An Elementary Account of the Logic of Relatives. MS [R] 537; MS [W] 585. | Manuscript |  | 
          
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  Peirce, C. S. (1886). One, Two, Three. MS [W] 573; MS [R] 905. | Manuscript |  | 
          
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  Peirce, C. S. (1886). One, Two, Three: Kantian Categories. MS [R] 897. | Manuscript |  | 
          
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  Peirce, C. S. (1887). Logical Machines. The American Journal of Psychology, 1, 165-170. | Article in Journal |  | 
          
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  Peirce, C. S. (1887-1888). A Guess at the Riddle. MS [R] 909. | Manuscript |  | 
          
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  Peirce, C. S. (1888). Trichotomic [W]. MS [R] 1600. | Manuscript |  | 
          
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  Peirce, C. S. (1890 [c.]). Proof of the Fundamental Proposition of Arithmetic. MS [R] 47. | Manuscript |  | 
          
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  Peirce, C. S. (1890). Logic and Spiritualism [R]. MS [R] 878. | Manuscript |  | 
          
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  Peirce, C. S. (1890-1913). Letters to Paul Carus. MS [L] 77. | Manuscript |  | 
          
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  Peirce, C. S. (1891 [c.]). Questions on William James's Principles of Psychology 1. MS [R] 1099. | Manuscript |  | 
          
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  Peirce, C. S. (1891). Evolutionary Love [R]. MS [R] 957. | Manuscript |  | 
          
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  Peirce, C. S. (1891). Reply to the Necessitarians. MS [R] 958. | Manuscript |  | 
          
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  Peirce, C. S. (1891). Review of William James's "The Principles of Psychology". The Nation, 53, 15, 32-33. | Article in Journal (R) |  | 
          
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  Peirce, C. S. (1891). The Architecture of Theories. The Monist, 1, 161-176. | Article in Journal |  | 
          
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  Peirce, C. S. (1892). Man's Glassy Essence. The Monist, 3, 1-22. | Article in Journal |  | 
          
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  Peirce, C. S. (1892). The Critic of Arguments. II. The Reader is Introduced to Relatives. The Open Court, 6, 3415-3418. | Article in Journal |  | 
          
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  Peirce, C. S. (1892). The Law of Mind. The Monist, 2(4), 533-559. | Article in Journal |  |