INDEX. 



437 



Motion (continued'). 



an affection of matter, 186. 



vast effects of, 217. 

 Mountain tops, heat of, 282. 



H 



Nebular hypothesis, 230. 

 Nerve-power, source of, 430. 

 New views, public acceptance of, 9. 

 New doctrine of forces, how far accepted, 



xiv. 

 Newton, xiii., xvlii., 241, 2T6, 282, 368, 378. 



speculations on light, 137. 

 Niepce de St. Victor, M., 125. 

 Numbers the highest aim of investigation, 



Oersted's discoveries, 5. 

 Optic axis of crystals, 171. 

 Organic beings, source of their motions, 

 237. 



kingdoms of nature, relations to each 



other, 433. 



co-ordination, 410. 



correlations, Grove on, 172. 

 Organization, distinction between high and 



low grades of, 408. 

 Origin of the sun's heat, 276. 

 Origin of terrestrial power, 236, 840. 



Page, Mr., 151. 



Particles, in Avhat sense the term is used 



by Grove, 39. 

 Pasteur, M., 132. 

 Peltier, M., 96. 

 Perpetual motion, 191, 192, 212, 219, 221, 



Persistence of force, xxxix. 

 Photography, chemistry of, 111. 

 Physical science of the present distin- 

 guished from that of the past, 402. 

 Planetary atmospheres, 137. 



motions, 267. 



system, structure of, 230. 

 Planets, temperatures of, 121. 

 Plants, chemistry of, 420. 

 Plenum, a universal, 134. 

 Plucker, 171. 



Plurality of worlds, 122. 



Poisson, M., 81. 



Pouillet, M., 244, 264, 280. 



Powell, Baden, on Newton's rings, 41. 



Practical arts after the middle ages, 211. 



Ptolemaic system, 11. 



Q 



Qualities of matter, transference of, 15. 



Eankine, Mr., xxviii. 

 Eegnault, M., 225. 



Respiration in cold-blooded animals, 429. 

 the earth, diminution of the, 



Eoget, Dr., 4. 

 Eotati. 



Eoyal Institution, foundation of the, xxx. 

 Eule for the investigation of nature, 316, 



318. 

 Eumford, Count, 4. 



summary of his claims, xv 4 



sketch of, xvii. 



researches of, xx., 347. 



Seebeck, Dr., 118. 



Seguin, M., 4, 76. 



Sensations of heat disturb the judgment, 

 49. 



Sensations, misleading, 174. 



Science, tendency of, toward immaterial- 

 ism, xii. 



' the great event in the general progress 

 of, xvi. 



the true scope of, xxxi. 



* discovery of its fundamental principle, 



316. 



Simultaneous discovery, examples of, xv. 

 Social forces, correlation of, xxxvi. 

 Solar radiation, effects of, 286. 

 origin of organic power, 240. 



heat, amount of, 243, 264. 



atmosphere, 288. 



radiation, dynamical effects of, 403, 404. 

 Sondhauss, Mr., 126. 



Sound and light, 259. 



Specific heat, dynamic view of, 53. 



Spectrum, analysis of, 62. 



Spencer, Herbert, on the persistence of 



force, xxxix. 



Steam engine, action of, 220. 

 Stephenson, George, 115. 

 Stewart, Balfour, 61. 

 Store of force in the universe, 232. 

 in the planetary system at present, 



Structure of bodies as affecting heat- 

 motion, 55. 

 Sun, cooling of, 265. 



Talbot, Mr., 112. 

 Tension, a static force, 22. 

 Theories, immature, 110. 



new, how they are to be judged, 196. 



the test of, 276. 

 Theorizing, what is it? 198. 

 Thermography, 58. 



Thilorier's experiment on carbonic acid, 48. 

 Thompson, Prof., 52, 227, 229. 

 Tidal wave, 241, 291. 



Time as an element of dynamic changes, 

 360. 



an element in. the sequence of phe- 



nomena, 17. 



necessity of its early measurement, 320. 



