G. Articles in Baldwin’s “Dictionary of Philosophy”: Individual, kind, matter and form, possibility, pragmatism, priority, reasoning, sign, scientific method, sufficient reason, synechism, and uniformity.
H. “Pearson’s Grammar of Science,” in Popular Science Monthly, Vol. 58 (1901), pp. 296-306. (A critique of Pearson’s conceptualism and of his utilitarian view as to the aim of science.)
II. Writings of Predominantly Logical Interest.
A. Five Papers on Logic, read before the American Academy of Arts and Sciences. Published in the Proceedings of the Academy, Vol. 7 (1867).
1. “On an Improvement in Boole’s Calculus of Logic,” pp. 250-261. (Suggests improvements in Boole’s logic, especially in the representation of particular propositions. The association of probability with the notion of relative frequency became a leading idea of Peirce’s thought.)
2. “On the Natural Classification of Arguments,” pp. 261-287. (A suggestive distinction between the leading principle and the premise of an argument. Contains also an interesting note (pp. 283-284) denying the positivistic maxim that, “no hypothesis is admissible which is not capable of verification by direct observation.”)
3. “On a New List of Categories,” pp. 287-298. The categories are: Being, Quality (Reference to a Ground), Relation (Reference to a Correlate), Representation (Reference to an Interpretant), Substance. “Logic has for its subject-genus all symbols and not merely concepts.” Symbols include terms, propositions, and arguments.
4. “Upon the Logic of Mathematics,” pp. 402-412. “There are certain general propositions from which the truths of mathematics follow syllogistically.”
5. “Upon Logical Comprehension and Extension,” pp. 416-432. (Interesting historical references to the use of these terms and an attack on the supposed rule as to their inverse proportionality.)
B. “Description of a Notation for the Logic of Relations,” in Memoires of the American Academy, Vol. 9 (1870), pp. 317-378. (Shows the relation of inclusion between classes to be more fundamental than Boole’s use of equality. Extends the Booleian calculus to DeMorgan’s logic of relative terms.)