43* 



THE SCIENCE OF LOGIC 



Cumulative evidence, i., 394-5 ; ii., 141-2, 

 217, 249, 262. 



DARWIN, ii., 139, 334. 



DAVY, ii., 168. 



Deductio ad impossibile, v. reductio. 



Deduction, and induction, ii., 8, 9, 48-55, 

 117-19, 243-8 (cf. inference, andmethod). 



Deductive inference, i., 391-2, 412 ; de 

 finitions of, ii., 51 ; in mathematics, ii., 

 25, 243-8. 



Definite singular propositions, i., 193. 



numerical propositions, i., 197. 

 Definition, its functions, i., 89-91 ; ii., 2 ; 



formation of, i., 91-5 ; fixity of, 95-6 ; 

 limits of, 96-7 ; ii., 237 ; nominal and 

 real, i., 99-106, 134, 252 ; existential 

 import of, 101-2, 407 ; private, 106 ; 

 genetic, 106-7 ; physical, 107 ; rules of, 

 108-11 ; as involving fallacy in infer 

 ence, 405-6 ; not arbitrarily invented in 

 mathematics, ii., 25-6, 230, 237. 



DELEHAYE, ii., 253. 



DELORME, ii., 37. 



Demonstration, i., 333-4, 345 ; ii., 52-3, 

 108, 142 ; and explanation, 224, 235-9 5 

 conditions of, 225-0 ; kinds of, 232-5 ; 

 and verification, 245-8. 



DE MORGAN, i., 39, 232, 307, 313, 314, 

 316, 389 ; ii., 306, 310, 318, 320, 333. 



DE MUNNYNCK, ii., 145. 



Denial, nature and ground of, i., 203-6. 



Denotation, i., 52-64. 



DE QUINCEY, i., 103. 



Derivative laws, ii., 208. 



DESCARTES, i., 149 ; ii., 10, 291. 



Description, i., 107. 



Descriptive hypotheses, ii., 123-5. 



Design, v. purpose. 



Desitive propositions, i., 200. 



DE SMEDT, ii., 253. 



Destructive dilemma, i., 367-8. 



hypothetical syllogism, i., 359. 

 Determination, and negation, i., 204-6. 



of moods of syllogism, i., 320-4, 327- 



3i. 



Determinative clauses, i., 157, 198. 



Determining cause, ii., 64. 



Development, conception of, ii., 10. 



DE WULF, i., 93, 318; ii., 10, 17, 19, 128, 

 138, 144, 231, 252, 334. 



Diagnosis, i., 125, 345. 



Diagnostic definition, i., 133. 



Diagrams, Euler s, i., 211-12, 236, 310. 



Dialectic, ii., 52. 



Dichotomy, i., 115-7. 



Dictum de omni et nullo, i., 209, 300-4; 

 and rules of syllogism, 305-6 ; and first 

 figure, 344, 386, 389 ; its real and con 

 ceptual import, 390, ii., 27 ; and uni 

 formity of nature, 115-9. 



de diverse, i., 346. 

 Didactic method, ii., 7, 14-16. 



Difference, method of, ii., 175-9 com 

 bination with agreement, 179-85. 



Differentia, predicable of, i., 77, 81-2. 



Dilemma, i., 367-75 ; formal and material 

 validity of, 370-3. 



DIOGENES of Laerte, i., 40. 



Direct determination of valid moods of 



syllogism, i., 329-31. 

 reduction of syllogisms, i., 335-9. 



Discourse, universe of, i., 54, 65, 161, 249- 

 52, 255. 



Discovery, and instruction or exposition, 

 ii., 14, 15 ; and proof, 42-3 ; deductive 

 and inductive, 243-8. 



Discretive propositions, i., 271. 



Discursive reasoning, i., 18, 295, 297. 



Disjunctive propositions, i., 280-91 ; in 

 calculus of probability, ii., 275-82. 



syllogisms, pure, i., 362 ; mixed, 363- 

 5 ; in induction, ii., 39, 50-2, 142, 172, 

 182. 



Disputationes quodlibetales, ii., 17. 



Distinctive explanation, i., 107. 



Distribution of terms in propositions, i., 

 186-8 ; intensive, 202, 209 ; of conse 

 quent in hypothetical, i., 270-1, 279, 

 357- 



Distributive use of terms, i., 47 ; ii., 305. 



Divisio, fallacy of, i., 47, 226 ; ii., 301, 

 304-6. 



Division, logical, functions of, i., 112-13 ; 

 nature of, 113-4; formal and material, 

 115-7 ; rul es of, ij.8-21 ; and definition, 

 113 ; and disjunctive judgments, 286, 

 289. 



Divisions of logic, i., 17-19 ; ii., 2-7. 



Documents, historical, ii., 256-8. 



Double method of agreement, ii., 179-81. 



Doubt, ii., 213. 



and modality, i., 184-5; in &quot;if&quot; judg 

 ments, 267-9. 



Dualism, v. monism, theism. 

 DUHEM, ii., 129, 132. 



Education, and method, ii., 14. 



Eductions, i., 229-46 ; table of, 245 ; 

 material, 245-7; and existential import, 

 256-8 ; from conditionals, 272-3 ; from 

 hypothetical, 278-9 ; from alternatives 

 or disjunctives, 290-1 ; and rule of 

 quality in syllogism, 311-12. 



Effect and cause, ii., 63 ; as correlative, 

 80- 1 ; not identical, 82. 



Effects, intermixture of, ii., 195-6. 



Efficient cause, ii., 62-5 ; traditional and 

 empirical concepts of, 70-80 ; kinds of, 

 71 ; efficiency not necessity, 73-4 ; and 

 space relations, 83. 



finds, ii., 265. 



f0(m, i., 349, 354. 



Elements of syllogism, i., 294-7. 



Elimination, in inductive analysis, i., 275 ; 

 &quot;-. 38, 50, 52, 55, 165-72, 244 ; in de- 



