440 



THE SCIENCE OF LOGIC 



Periodic changes, ii., 189-90. 

 Permanent causes, ii., 188. 

 Permutation, i., 232. 

 Per se predication, i., 170-4. 

 &quot; Personal equation,&quot; ii., 204. 

 Petitio Principii, fallacy of, ii., 235, 301, 

 317-22. 



and syllogism, i., 401-7 ; and grounds 

 of belief in uniformity of nature, ii., 

 103-5, i:[ 6 321-2. 



PETRUS HISPANUS, i., 317, 318, 352. 

 Phantasm, i., 3-4. 

 Phantoms, Bacon s, v. idola. 

 Phenomenism, ii., 5Q-6o, 130, 146, 322-4. 

 Phenomenon, and cause, ii., 76-80, 128- 



31- 



Philology, on thought and speech, i., 



144-5- 



Philosophy, i., 19, 135 ; and method, ii., 

 10 (v. sciences). 



errors in, ii., 325-6. 



Physical certitude, ii., 98-100, 106 ; nature 

 and source of, 215-6, 221. 



causes, ii., 64, 71. 



division, i., 107, 114. 



judgments and propositions, i., 170-80. 



law and necessity, ii., 78, 100-13, 

 123-4, 221-3. 



sciences, rise of, ii., 4-5 ; scope of, 

 26, 62-3, 74, 75, 110-13, 124, 131, 133 ; 

 and method, 49, 63, 68. 



PIAT, ii., 15. 



PICTET, ii., 125. 



Place, category of, i., 142. 



PLATO, i., 9, 10, ii, 92; ii., 19, 20, 336. 



Plurality of causes, i., 275; ii., 84-92, 



187, 244, 247-8. 



Plurative propositions, i., 195-6. 

 Plures interrogations, fallacy of, i., 379 ; 



., 314-5- 

 POINCARE, H., ii., 131, 133, 134. 



L., ii., 201, 202, 203. 

 POISSON, ii., 285. 

 Polylemma, i., 367. 

 Polysyllogism, i., 377-8. 

 Ponendo tollens, modus, i., 364-5. 

 Poncns, modus, i., 359. 

 PORPHYRY, i., 72, 85. 

 Porphyry s tree, i., 78-9, 116. 

 Positive instances, function of, ii., 171. 



- terms, i., 65-7. 

 Positivism, ii., 15, 59, 124, 130. 

 Possible propositions, i., 184. 

 Possibility, sphere of logical, i., 249-50 ; 



and actual reality, 264. 

 Postpraedicamenta, i., 136. 

 &quot; Post hoc ergo propter hoc,&quot; ii., 328-9, 



334- 

 Postulates, ii. , 10, 23,60, 106-7, IO 9 IIJ J 



justification of, 142-5. 

 Posture, category of, i., 142, 144. 

 Practical certitude, ii., 262 (cf. moral 



certitude}. 



Practical science, i., 15. 



Praedicabilia, i., 72. 



Praedicamenta, i., 7, 136 (v. categories}. 



PRANTL, i., 39, 136, 318. 



Predicables, Aristotle s and Porphyry s, 

 i., 72-3 ; classification of, 73-6 ; defini 

 tions of, 76-7 ; and categories, 138 ; as 

 relations, ibid. 



Predicamental line, i., 78. 



Predicate, i., 154-5 ; distinction from sub 

 ject, 156-8 ; distribution of, 187 ; quanti 

 fication of 202-16, 332. 



Predication, views of, i., 207 sqq. , predi 

 cative view of, 207-8, 301, 302-4. 



Premisses, i., 292 ; discovery and proof, 

 f&amp;gt; 375 ; ii&amp;gt; ! 2, 23-4 ; deductive and 

 inductive, 246-7. 



Prescription, argument from, ii., 259. 



Primae intentiones mentis, i., 32, 73. 



Principle, i., 8 ; logical and real, 135 ; in 

 syllogism, 295. 



Principles, of demonstration, ii., 226 ; 

 of thought, i., 23-8 ; and being, 135 ; 

 ii., 226; &quot;regulative,&quot; ii., 13, 143-5, 

 227 ; conditional and unconditional, ii., 

 107-13. 



Prius natura, and prius nobis, ii., ii, 16, 

 65, 227-9, 231-2. 



Private definition, i., 106. 



Privative conception, inference by, i., 

 232. 



terms, i., 69. 



Probability, i. 19 ; and modality, 183-5 ; 

 ii., 5, 151 ; in analogy, 153-61 ; in in 

 duction or generalization, 206-9 ; 212- 

 14, 263 ; nature of, 260-3 ; sources of, 

 263 ; calculation of, 262-85 ; inverse, 

 278-82. 



Probable arguments, ii., 263-8. 



Problematic judgments, i., 180-5, 347. 

 358. 



Progressive chains of reasoning, i., 377- 



83- 



Proof, v. demonstration and explanation. 



Proper names, i., 46 ; and connotation, 

 63, 96. 



Property, i., 77, 82-6 ; and necessary 

 judgments, i., 171-80; physical, 176; 

 ii., 45-7, 125, 237. 



&quot; Proportio,^ ii., 160. 



Propositio infinita, i. 202. 



Propositions (v. judgment}, primi, secun- 

 dii et tertii adjacentis, i., 155 ; struc 

 ture of, 154-8; natural and inordinate, 

 156 ; formulation of, 164-6 ; simple, 

 complex and compound, 169, 197-200 ; 

 necessary and contingent, 170-80 ; pro- 

 positio per se nota, and per aliud nota, 

 170; ii., 24; modal, ii., 180-5, 227; 

 form of, 186 ; universal and particu 

 lar, 188-98 ; collective, 189 ; singular, 

 192-3, 227 ; plurative, 195-6 ; exponible, 

 198-200 ; indesignate, 200-2 ; views on 



