INDEX 



Hertz, Heinrich, 312. 

 Hertz waves, 51, 79, 137. 

 Heydweiler and Landoldt, 165. 

 Hill, Croft, 236. 

 Hipparchus, 10, 23, 26. 

 Hittorf, 148. 

 Hooke, Robert, 25. 

 Huxley quoted, 2, 253, 270. 

 Huygens, 136. 

 Hydroids, growth of, 205. 

 Hypatia, 24. 



IMMUNITY, mechanism of, 278. 

 Instincts, theory of, 200. 

 Institute, Pasteur, 346. 

 Ions, 209, 211, 219. 

 Irritabilttt, 254. 

 Isomeres, chemical, 173, 281. 



JARDIN DBS PLANTES, 350. 

 Jenner, 274. 



KANT, 244. 



Kelvin, Lord, 30, 82, 117, 142. 



Kipling quoted, 310. 



Kirchhon, 299. 



Kohlrausch, 305. 



Kolbe, 145. 



LANGLEY. PROFESSOR S. P., 

 inventor of the bolometer, 



49- 



Laplace, 21, 72. 

 Larmor, 221. 

 Lavoisier, 171, 179, 251. 

 Layard, 25. 

 Leeuwenhoek, 24. 

 Lehmann quoted, 2. 

 Lenard, 153. 

 Leverrier, 85. 

 Liebig, Baron, 172, 257. 

 Liedentopf and Zsigmondy, 



120. 

 Life, as a fermentation, 229; 



reversibility of, 239. 

 Light-waves. 88, 109. 

 Lister, Lord, 334. 



Liver cell, activity of, 237 ; size 



of, 244. 



Living molecules, size of, 245. 

 Lockyer, Sir Norman, 64. 

 Lodge, Sir Oliver, 313. 

 Loeb, Jacques, 199. 

 Lucretius, 103. 



MAQUENNE, LEON, 351. 



Marconi, 51, 311. 



Mathews, Dr. A. P., 199, 217, 



266. 

 Matter, divisibility of, 89 ; 



fourth state of, 137 ; radiant, 



Mayer, Professor, 122. 



Mendele6f quoted, 168. 



Mercadier, 324. 



Metallurgy, development of, 

 336. 



Metchnikoff, Elias, 244, 276. 



Meudon laboratory of vege- 

 table chemistry, 187. 



Meyer, O. E., 116. 



Micron, unit of measure, 105. 



Mind, chemistry of, 251. 



Molecules, measurement of, 

 116. 



Moleschott, 252. 



Miiller, Johannes, 300. 



NAPIER, BARON, 24. 



Napoleon, 333. 



Nerves, stimulation of, 218, 



265. 



Newcomb, Simon, 98. 

 Newton, 21, 22, 24, 43, 84, 



136, 144; what he knew, 



292. 

 Newton, Professor, of Yale, 



331- 



Newton's rings, 108. 

 Newtonian theory of light, 



136. 



Niagara Falls, dynamos, 134 

 Nicetas of Syracuse, 6. 

 Nitrates, artificial, 189. 





