436 



INDEX. 



Heat (continued). 



chemical and magnetic Influence of, 64. 



as producing motive-power, 68. 



practical application of, 77. 



produced by chemical combination, 



cause of, 161. 



definition of, 226. 



force only available in the cooling pro- 



cess, 228. 

 -7 universal law of, 261. 



sources of, 261. 



solar, its chemical origin, 266. 



developed by friction, 277. 



upon high mountains, 282. 



lost by volcanoes, 310. 



lost by the ocean, 311. 



and motion, convertibility of, 823. 



and work, 326. 



converted into organizing force, 412. 

 Helmholtz, 175. 



biographical notice of, 210. 



claims of, 224. 

 Henry, Prof., xxviii., 290. 

 Herschel, Sir John, 119, 264. 

 Herschel, Sir W., 118, 136. 



his hypothesis of the sun's action, 260. 

 Hipparchus, 243. 



History of scientific discovery, xv. 

 Holtzmann, 351. 

 Homer, M., 312. 

 Hume on causation, 16. 

 Huxley, Prof., 411. 

 Hydraulic ram, 4. 



Indestructibility of matter, xii. 

 Inertia, relation to forces, 369. 

 Intellectual and physical forces, xxxv. 

 Intensity of the sun's heat, 270. 

 Interaction of natural forces, 211. 

 Insects, development of, 422. 



Joule, Dr. J. P., xxiv., 8, 83, 151, 224, 312. 



Kant, 23. 



Karsten, 85. 



KirchofTs researches, 62. 



Knoblauch, M., 56, 118. 



Knowledge, slow growth of, 12. 



Laplace, 231, 242, 243, 291. 

 Latent heat, 41, 348. 

 Lavoisier, xii. 

 Leconte, Prof., xxviii. 

 Liebig, vi, 174, 175, 238, 430. 



biographical notice of, 386. 

 Light, polarization of, 110. 



chemical action of, 111. 



affects all forms of matter, 115. 



Light (continued'). 



produces the other forces, 116. 



influence of the recipient surface upon, 



120. 



and sound, analogies of, 126. 



and molecular changes, 130. 



a motion of ordinary matter, 133. 



its loss or absorption, 189. 



function of, in organization, 415. 



Life of the higher animals, in what it con- 

 sists, 432. 

 Living force, 218. 

 Littrow, 271. 



M 



Machines compared with the living sys- 

 tem, 79. 



driving force of, 214, 387. 

 Muggi, Dr., 148. 



Magnetism a directive force, 142. 



influence of, upon light and heat, 145. 



as an initiating force, 147. 



static and dynamic. 149. 

 Magneto-electric machines, 222. 

 Marrion, Mr., 151. 



Masson, M., 135. 



Mathematics, function of, in investigation, 



377. 

 Matter, ultimate structure of may never 



be known, 187. 



Matteucci, 79, 84, 97, 151, 172, 175. 

 Mayer, Dr., 3. 



Tyndall's estimate of, xxx. 



biographical sketch of, 250. 



physiological commencement of hia 



inquiries, 324. 



secures his discovery against rival 



claimants, 224. 



various references to, xxix., 241, 327, 



350, 389, 465. 



Measure of the sun's heat, 264. 

 Mechanical problem, the modern, 212. 



force and heat, 262. 



origin of solar heat, 276. 



equivalent of heat, 316, 391. 



applications of, 353. 



Melloni, researches of, 59. 

 Mental and vital forces, xxxii. 

 Metamorphosis retrograde in animals, 421. 

 Meteorites, 270. 



heat generated by, 234. 

 Metaphysics in science, 360. 



Modern science, alleged materializing ten- 

 dency of, xi. 



Molecules, how the term is employed by 

 Grove, 39. 



Moon, effect of collision with the earth, 

 804 



Mongolfier, M., 4. 



Moral forces, correlation of, xxxvii. 



Morgan, Mr., 135. 



Morfchini, 117. 



Mossoti, 171. 



Motion, as an affection of matter, 25. 



never destroyed, 27. 



produces heat, 28. 

 produces various forces, 37. 



