George Boole. Of syllogisms. Reprinted from 191. Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 177–191. - Rudolf Carnap. Elementary and abstract terms. Reprinted from IV 117. Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 221–229. - Lewis Carroll (Charles Lutwidge Dodgson). The bilateral diagram. Reprinted from 674. Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 230–233. - Gottlob Frege. Definitions. Reprinted from XVIII 92(12). Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 329–342. - John Neville Keynes. Propositions. Reprinted from 631. Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 453–470. - Augustus De Morgan. On the syllogism. Reprinted from 201. Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 556–578. - Josiah Royce. The principles of logic. Reprinted from 1403. Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 654–683. - Bertrand Russell. Definition of pure mathematics. Reprinted from 1116. Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 684–692. - Ludwig Wittgenstein. Facts. Reprinted from 2812. Classics in logic, Readings in epistemology, theory of knowledge and dialectics, edited by Dagobert D. Runes, Philosophical Library, New York1962, pp. 791–793.