7J^2 



INDEX. 



Noble, Captain, chronoscope, 308, 

 616. 



Nomenclature, laws of botanical, 

 7-27. 



Non-observation, arguments from, 

 411. 



Norwood's measurement of a degree, 

 272. 



Nothing, 32. 



Number, nature of, 153, 156; con- 

 crete and abstract, 159, 305. 



Numbers, prime, 123 ; of Ber- 

 noulli, 124 ; figurate, 183 ; tri- 

 angular, &c., 185. 



Numerical abstraction, 158. 



Observation, 399 ; mental con- 

 ditions, 402 ; instrumental and 

 sensual conditions, 404 ; external 

 conditions, 407. 



Obverse statements, 144. 



Ocean, dciith of, 297. 



Odours, 732. 



Oersted, on electro-magnetism, 530, 

 535. 



Or, meaning of, 70. 



Order, of premises, 114 ; of terms. 

 33. 



Orders of combinations, 194. 



Original research, 574. 



Oscillation, centre of, 3G4. 



Ostensive instances, 608. 



Ozone, 663. 



TT, value of, 234, 529, 

 I'aek of cards, arrangement of, 241. 

 Paley on design, 762, 763. 

 Parallax, of stars, 344; of sun, 



560. 

 Parallel forces, 652. 

 Paralogism, 62. 

 Parity of reasoning, 268. 

 Partial identities, 40, 55, 57, 111 ; 



induction of, 130. 

 Particular quantity, 56. 

 Particulars, reasoning from, 227. 

 Partition, 29. 

 Pascal, 176 ; arithmetical machine, 



107 ; arithmetical triangle, 182 ; 



binomi:'.! formula, 182 ; error in 



probabilities, 213 ; barometer, 



519. 

 Passive state of steel, 659. 

 I'edisis, or molecular movement 



of microscopic particles, 406, 



6i2. 



Poirce, Professor, 23 ; on rejection 

 of observations, 31)1. 



Pendulum, 290, 302, 31-5; fanlis 

 of, 311 ; vibrations, 453, 454 ; 

 cycloidal, 461. 



Perfect induction, 146, 149. 



Perigon, 306. 



Pern)utations, 173, 178 ; distinction 

 from combinations, 177, 



Personal error, 347. 



Photometry, 288. 



Physiology, exceptions in, 666, 



Planets, conjunctions of, 181, 187, 

 657 ; discovery of, 412 ; motions, 

 457 ; perturbations of, 657 ; 

 classification, 683 ; system of, 

 748. 



Plants, classification of, 678. 



Plateau's experiments, 427, 



Plato on science, 595. 



Plattes, Gabriel, 434, 438, 



Pliny on tides, 451, 



Plumb-line, divergence of, 461, 



Plurality, 29, 156. 



Poinsot, on probability, 214. 



Poisson, ou principle of the in- 

 verse method, 244 ; work on 

 Probability, 395; Newton's rings, 

 470 ; simile of ballot box, 524. 



Polarisation, 653 ; discovery of, 

 530. 



Pole-star, 652; observations of, 366, 



Poles, of magnets, 365 ; of batterv, 

 421. 



Political economy, 760. 



Por{)hyry, on the Predicables, 698 ; 

 tree of, 702, 



Port Koyal logic, 22, 



Positive philosojihy, 760, 768, 



Pouillet's pyrhelionieter, 337. 



Powell, Baden, 623 ; on planetary 

 motions, 6C0, 



Power, (leiinitiou of, 224. 



Predicables, 698. 



Prediction, 536, 739 ; in science of 

 liglit, 538 ; theory of undulations, 

 540 ; other sciences, 542 ; by 

 inversion of cause andetl'ect, 545. 



Premises, order of, 114. 



Prime numbers, 123, 139 ; formula 

 for, 230. 



Princijiia, Newton's, 581, 583. 



Principle, of ]]rob!ibility, 200 ; i/i- 

 verse method, 242 ; loi'ced vibi-a- 

 tions, 451 ; approximation, 471 ; 

 co-existence of small vibiatious. 



