IXDEX. 



475 



i. 136; freewill, 257; quantification 

 of predicate, ii. 387.&quot; 



Hamilton, Sir W. Rowan, ii. 175. 

 Haughton, Rev. S., on muscular exer 

 tion, ii. 1 14. 



Heat, ii. 297 ; unit of, i. 378; measure 

 ment of, 405 ; mechanical equivalent 

 of, ii. 211. 



Heavy glass, ii. 235, 260. 



Helmholtz, sound vibrations, ii. 8, 20, 

 98. 



Hereditary descent, ii. 407. 



Herschel, Sir J. F. W., plagihedral 

 quartz crystals, i. 148, 283 ; density 

 of earth, 210; photometry, 316, 

 352; numerical precision, 317; unit 

 of length, 367; actinometer, 389; 

 use of mean, 421; method of least 

 squares, 437 ; double stars, 457; ii. 

 125 ; active and passive observation, 

 2 ; fluorescence, 2 ; full moon, 15 ; 

 comets, 16; spectrum, 39 ; collective 

 instances, 59 ; principle of forced 

 vibrations, 65, 332 ; meteorological 

 variations, 112; direct action, 129; 

 use of theories, 136 ; ethereal 

 medium, 145 ; experimentum crucis, 

 149 ; interference of light, 175 ! 

 interference of sound, 1 76 ; residual 

 phenomena, 212; discovery by ana 

 logy, 286. 



Hindenburg, combinatorial analysis, i. 

 198. 



Hipparchus, i. 337; ii. 306; use of 

 moon, i. 342. 



Hobbes, cause, i. 257; time, 359; 

 hypothesis, ii. 138. 



Hofmann, crith, i. 374; prediction, ii. 

 181 ; anomalous vapour densities, 340. 



Homogeneity, law of, i. 179. 



Hooke, ii. 153, 342 ; gravity, 46 ; 

 philosophical method, 135 ; memory, 

 288. 



Horrocks, use of means, i. 415; hypo 

 thesis, ii. 135 ; planetary motions, 

 281. 



Huxley, on classification, ii. 348, 354. 



Huyghens, Saturn s satellites, i. 341 ; 

 ii. 280 ; pendulum, i. 353, 369 ; 

 cycloidal pendulum, 394; differential 

 method, 399 ; stars, ii. 8 ; projectiles, 

 85 ; philosophical method, 135 ; un- 

 dulatory theory, 151; double refrac 

 tion, 231 ; analogy, 301. 



Hybrids, ii. 416, 417. 



Hydrogen, dilatation of, ii. 91; refrac 

 tive power, 1 60; metallic nature of, 

 366. 



Hygrometry, ii. 206. 



Hypothesis, use of, i. 262 ; requisites 

 of, 307 ; substitution of simple, ii. 

 74; representative, 156; descriptive, 

 359- 



I. 



Identity, expression of, i. 18; pro 

 pagating power, 24 ; simple, 44 ; 

 partial, 47; limited, 51; inference 

 from, 61, 66. 



Illicit process, i. 77, 119. 



Incominensurables, i. 319. 



Independence, of events, i. 233 ; of 

 small effects, ii. 96. 



Indexes, value of, ii. 405. 



India-rubber, ii. 182. 



Indifferent circumstances, abstraction 

 of, i. 112 ; exclusion of, ii. 26. 



Indirect method, i. 133; ii. 370; rules 

 of, i. 105; illustrations of, 113. 



Induction, i. 13, 70, 139 ; inverse 

 nature of, 14 ; of partial identities, 

 149; perfect, 164; imperfect, 168 ; 

 grounds of, 262. 



Inequality, reasoning by, i. 184, 186. 



Inference, process of, i. 1 1 ; immediate, 

 60; from two simple identities, 61 ; 

 sum of predicates, 73 ; with disjunc 

 tive propositions, 90 ; indirect method 

 of, 95; nature of, 136; mathe 

 matical, 183. 



Infima species, ii. 380, 382. 



Infimteness of universe, ii. 431. 



Inhabitants of planets, ii. 301. 



Instantiae, citantes, evocantes, radii, 

 curriculi, i. 313 ; monodicae, irregu- 

 lares, heteroclitae, ii. 260 ; clan- 

 destinae, 262. 



Insufficient enumeration, i. 199. 



Insulators, ii. 265. 



Intension, of logical terms, i. 31 ; pro 

 positions, 57. 



Interpolation, ii. 120. 



Inverse, operation, i. 140 ; problem, 



154- 



Iodine, ii. 155, 366. 



Iron, magnetic power of, ii. 40. 



Isomorphism, ii. 312, 330. 



J. 



Jet of water, ii. 9, 58, 60. 



Jevons, W. S., cirrous clouds, ii. is, ; 

 elevated rain-guage, 40; experiments 

 on liquids, 60 ; experiments on 

 muscular exertion, 114; cometary 

 retardation, 213; microscopic move 

 ments, 264. 



Joule, ii. 179, 182, 187, 197; thermo 

 pile, i. 349 ; heat of compression, 

 350 ; temperature of air, 398 ; ex 

 periments on heat, 402; measure 

 ment of temperature, ii. 47 ; gases, 

 56; equivalent of heat, 21 1. 



Jupiter, satellites of, ii. 298, 322 ; 

 eclipses of satellites, i. 433 : figure 

 of, ii. 196. 



