INDEX. 



779 



with partial identities, 55 ; by 

 sum of predicates, 61 ; by dis- 

 junctive propositions, 76 ; indi- 

 rect method of, 81 ; nature of, 

 118 ; principle of mathematical, 

 162 ; certainty of, 236. 

 Infima species, 701, 702. 



Infinkeness of universe, 738. 



Inflection of light, 420. 



Instantiae, citantes, evocantes, radii, 

 curriculi, 270 ; monodicse, irregu- 

 lares, heteroclitse, 608; clandes- 

 tine, 610. 



Instruments of measurement, 284. 



Insufficient enumeration, 176. 



Integration, 123. 



Intellect, etymology of, 5. 



Intension of logical terms, 26, 48 ; 

 of propositions, 47. 



Interchangeable system, 20. 



Interpolation, 495 ; in meteorology, 

 497. 



Inverse, process, 12 ; operation, 122, 

 689 ; problem of two classes, 134 ; 

 problem of three classes, 137 ; 

 problem of probability, 240, 251 ; 

 rules of inverse method, 257 ; 

 simple illustrations, 253 ; general 

 solution, 255. 



Iodine, the substance X, 523. 



Iron, properties of, 528, 670. 



Is, ambiguity of verb, 16, 41. 



Isomorphism, 662. 



Ivory, 375. 



JAMES, Sir H., on density of earth, 

 567. 



Jenkin, Professor Fleming, 328. 



Jevons, W. S., on use of mean, 361 ; 

 on pedesis or molecular move- 

 ment of microscopic particles, 406, 

 549 ; cirrous clouds, 411 ; spec- 

 trum analysis, 429 ; elevated 

 rain-gauges, 430 ; experiments 

 on clouds, 447 ; on muscular 

 exertion, 490 ; resisting medium, 

 570 ; anticipations of the electric 

 telegraph, 671. 



Jones, Dr. Bence, Life of Faraday, 

 578. 



Jordanus, on the mean, 360. 



Joule, 545; on thermopile, 299, 

 300 ; mechanical equivalent of 

 heat, 325, 347, 568 ; temperature 

 of air, 343 ; rarefaction, 444 ; 

 on Thomson's prediction, 543; 



molecular theory of gases, 548 ; 

 friction, 549 ; thermal pheno- 

 mena of fluids, 557. 

 Jupiter, satellites of, 372, 458, 638, 

 656 ; long inequality of, 455 ; 

 figure of, 556. 



KAMES, Lord, on bifurcate classifi- 

 cation, 697. 



Kant, disjunctive propositions, 69 ; 

 analogy, 597 ; doctrine of space, 

 769. 



Eater's pendulum, 316. 



Keill, law of emanating forces, 464 ; 

 axiom of simplicity, 625. 



Kepler, on star-discs, 390 ; comets, 

 408 ; laws of, 456 ; refraction, 

 501 ; character of, 578. 



Kinds of things, 718. 



Kins " 



Kirchhoff, on lines of spectrum, 245. 

 Kohlrausch, rules- of approximate 

 calculation, 479. 



LAGRANGE, formula for interpola- 

 tion, 497 ; accidental discovery, 

 531 ; union of algebra and geo- 

 metry, 633. 



Lambert, 15. 



Lamont, 452. 



Language, 8, 628, 643. 



Laplace, on probability, 200, 216 ; 

 principles of inverse method, 242 ; 

 solution of inverse problem, 256 ; 

 planetary motions, 249, 250; 

 conjunctions of planets, 293 ; 

 observation of tides, 372 ; at- 

 mospheric tides, 367 ; law of 

 errors, 378 ; dark stars, 404 ; 

 hyperbolic comets, 407 ; his 

 works on probability, 395; ve- 

 locity of gravity, 435 ; stability 

 of planetary system, 448, 746 ; 

 form of Jupiter, 556 ; corpuscular 

 theory, 521 ; ellipticity of earth, 

 565 ; velocity of sound, 571 ; 

 analogy, 597 ; law of gravity, 

 615 ; inhabitants of planets, 640 ; 

 laws of motion, 706 ; power of 

 science, 739. 



Lavoisier, mistaken inference of, 

 238 ; pyrometer, 287 ; on experi- 

 ments, 423 ; prediction of, 544 ; 

 theory, 611 ; on acids, 667. 



Law, 3 ; of simplicity, 33, 72, 161 ; 



