INDEX. 



339 



Discoveries of Geographers, 23, 



54-56. 

 Geologists, 8, 22, 



41, 159. 

 the Greeks, 7-14, 



20-27. 

 ,, Mathematicians, 25, 



55, 56, 60, 82, 96, 



100-102, IQI. 



the Medievalists, 



51-64, 70. 

 , , M en of the Revival, 



96-104. 

 the Moderns, 109, 



113-265. 



,, Palaeontologists, 1 1 6. 



Philologists, 151. 



Physicists, 13, 23, 



35-37, 57-63, 82- 



85, 98-100, IO2, 

 215. 



Physiologists, 22, 



37-41, 55, 57, 

 60, 62, 96, 98. 

 Discovery of America, 55. 

 Asteroids, 207. 



Chemical Elements, 



38, 172-178, 187. 

 Dissipation of Energy, 254. 

 Distance of Stars, 245. 

 Distillation, 38. 

 Division of the Circle, 190. 

 Inch, 263. 

 Labour, 296. 



Doctrine of Evolution (Progressive 

 Development), 12, 37, 82, 116, 

 117, 126, 128-148, 157, 167, 187, 



209, 211, 276, 287. 



Dollond [Physicist], 220. 

 Dominis (Antonio de), 59. 

 Doppler's Principle, 253, 262. 

 D'Orbigny [Naturalist], 120. 

 Double Refraction, 217. 



Stars, 204, 209, 251, 252. 

 Doublet of Wollaston, 228. 

 Dove [Geol.J, 167. 

 Draper, 29, 46. 

 Drawbacks to Science in Antiquity, 



Drebbel, 60. 



Du Bois-Reymond [Physicist], 224. 



Du Faye [Physicist], 216. 



Dulong [Chemist], his Law, 183; 

 [Physicist], 233, 241. 



Dumas [Chemist], Density of Com- 

 pounds, Unitary Theory, 184. 



Duns Scotus, 44, 65. 



Dunstable, 51. 



Duration of Ideas, 18. 



Solar Energy, 247. 



Duty (Performance of), 304. 



Dyes, 1 86, 188. 



Dynamical Theory of Heat, 242. 



Dynamic Radiation and Absorp- 

 tion, 257. 



Dynamics (Galileo's), 58, 6l ; 

 Definition of, Appendix AA. 



Dynamo (Tesla's), 259. 



EARLY Knowledge, xiti., i. 

 Earth, Density of, 223. 



an Electric Conductor, 240, 



245- 



Knowledge of the, 276. 



Magnitude of, 24. 



Motion of, 246. 

 Earthquakes, 41. 



Ebn Junis, Hakemite Tables, Pen- 

 dulum, 34. 

 Ebn Zoar ( Avenzoar), Acarus of the 



Itch, Pharmaceutics, 40. 

 Ebn Zohr, Cure of Diseases, 40. 

 Ebullition (Law of), 220. 

 Eclipses, 6. 

 Ecliptic, 5. 



Economy, 69, 283, 299. 

 of Cato, 17. 

 of Xenophon, 17. 

 Edison, 260, 275. 

 Eginhard, 47. 

 Egypt, Astronomy in, 5- 



Geometry in, 5. 

 Egyptian Science, 5, 6, 7. 



Temples, 5. 

 Ehrenberg [Physiol.], 124. 

 Eighteenth Century, Character of, 



272. 

 Elastic Forces and Fluids, 234. 



Z 2 



