782 



INDEX. 



Noble, Captain, chronoscope, 308, 



616. 

 Nomenclature, laws of botanical, 



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, depth of, 297. 



Odours, 732. 



Oersted, on electro-magnetism, 530, 

 535. 



Or, meaning of, 70. 



Order, of premises, 114 ; of terms, 

 38. 



Orders of combinations, 194. 



Original research, 574. 



Oscillation, centre of, 364. 



Ostensive instances, 608. 



Ozone, 663. 



w, value of, 234, 629. 

 Pack 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, 67, 111 ; 



induction of, 130. 

 Particular quantity, 56. 

 Particulars, reasoning from, 227. 

 Partition, 29. 

 Pascal, 176 ; arithmetical machine, 



107 ; arithmetical triangle, 182 ; 



binomial formula, 182 ; error in 



probabilities, 213 ; barometer, 



519. 



Passive state of steel, 659. 

 Pedesis, or molecular movement 



of microscopic particles, 406, 



612. 



Peirce, Professor, 23 ; on rejection 

 of observations, 391. 



Pendulum, 290, 302, 315; faults 

 of, 311 ; vibrations, 453, 454 ; 

 cycloidal, 461. 



Perfect induction, 146, 149. 



Perigon, 306. 



Permutations, 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, on 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 battery, 

 421. 



Political economy, 760. 



Porphyry, on the Predicates, 698 ; 

 tree of, 702. 



Port Royal logic, 22. 



Positive philosophy, 760, 768. 



Pouillet's pyrheliometer, 337. 



Powell, Baden, 623 ; on planetary 

 motions, 660. 



Power, definition of, 224. 



Predicables, 698. 



Prediction, 536," 739 ; in science of 

 light, 538 ; theory of undulations, 

 540 ; other sciences, 542 ; by 

 inversion of cause and effect, 545. 



Premises, order of, 114. 



Prime numbers, 123, 139 ; formula 

 for, 230. 



Prindpia, Newton's, 581, 583. 



Principle, of probability, 200 ; in- 

 verse method, 242 ; forced vibra- 

 tions, 451 ; approximation, 471 ; 

 co-existence of small vibrations, 



