INDEX 



College de France, 193, 348. 

 Colloids defined, 217. 

 Comte, 299. 

 Condorcet quoted, 330. 

 Consciousness, what is, 264. 

 Contact, effect of, on animal 



movements, 206. 

 Copernican system, 16, 17. 

 Corpuscles, 137-142, 160. 

 Crookes, Sir William, 47, 137- 



142. 



Crookes tube, 119, 148. 

 Ctesibius, u, 26. 

 Curie, 163, 296. 



DAGUERRE, 45. 



Dalton, John, 92, 340. 



Darwin, 21, 28. 



Davy, 133. 



Democritus, 103. 



Descartes, 23, 24. 



Dewar, Professor, 57, 352. 



" Difference- threshold ' in psy- 

 chology, 301. 



Dinner, the, of the future, 

 190. 



Dinokrates, 3. 



Diophantus, 24. 



Diphtheria, ubiquity of mi- 

 crobe of, 276. 



Draper quoted, 27. 



EARTH not made for man, 99. 

 Ehrlich, 284. 

 Electrical atom, 95. 

 Electricity, explanation of, 



131; speed of, 133. 

 Electro-chemistry, 341. 

 Electron, 95, 139. 

 Elements, the nature of the, 



93- 



Emerson quoted, 72, 102. 

 Emmerling, 236. 

 Empedocles, 22. 

 Enzymes, 233. 

 Eratosthenes, 6, 8, 26. 

 Euclid, 5, 17. 



Eudoxus, 29. 



Evaporation, electrical, 150. 



Explosions, measure of, 184. 



FARADAY, 106, 107, 133. 

 Fermentation, nature of, 231. 

 Ferments, inorganic, 238. 

 Fessenden, R. A., 304, 314. 

 Fischer, Emil, 93, 176. 

 Fleming, Professor, 316. 

 Fluorescein, 112. 

 Forest, Dr. Lee de, 314. 

 Franklin, Benjamin, 130, 131. 

 Fresnel, 136. 

 Fulton, 333. 



GALEN, 26. 



Galileo, 21, 23, 24, 85. 



Galvani, 133. 



Geissler tubes, 148. 



Gerhard t, 174. 



German university system, 



354- 



Germ-cell, size of, 246. 

 Gibbs, Professor Willard, 179, 



340. 

 Goethe, ideas of affinity of, 



179. 



Gold-leaf, thin, 106. 

 Golgi, explorations of brain by, 



259- 339- 



Gray, Ehsha, 333. 

 Growth, influence of electricity 



on, 188. 



HARDY, 217. 



Harvey, 23. 



Heat, upper limit of, 89. 



Heliotropism, 202. 



Helmholtz, von, quoted, 97, 



290. 



Henry, Joseph, 331. 

 Heraclitus, 21. 

 Hermite, M. 1', 66. 

 Hero, or Heron, n. 

 Herschel, Sir John, 126. 

 Herschel, Sir William, 66. 



358 



