INDEX. 



343 



Greek Syllogism, 10, II. 



Gregory I., 32, 51. 



Gregory I., II., III., 47- 



Grew [Botanist], 113. 



Grimaldi [Physicist], 224. 



Grimm [Philologist], 151. 



Grimm's Law, 151. 



Growth of Milling, 289-292. 



of Science rapid in the 

 Middle Ages, 71-73. 



Grove [Physicist], 242. 



Guericke [Physicist], Air Pump, 

 Magdeburg Hemispheres, First 

 Electric Machine, 216, 272. 



Guido d' Arezzo, 51. 



Guldinus, 60. 



Gunpowder, 38, 42, 52, 300. 



Gyroscope, 245. 



HAECKEL [BiolJ, 141 ; one of the 



Pillars of Darwinism, 146. 

 Hales [Botanist], 113. 

 Hall [Geologist], Experimental 



Geology, 161. 



Hall, C. M. [Physicist], 220. 

 Hallam, 99. 



Haller [Physiol.], 125, 273. 

 Halley [Astron.], 202, 272. 

 Hamilton, W. R. [Math.], 196. 

 Hand Mill, Benefits from, 290. 

 Harmonicon (Chemical), 256. 

 Harp of Marloye, 227. 

 Harriot, 58. 



Harvey, 60, 98, 272, 283. 

 Hatcher [Palaeontol.], 123. 

 Haughton, 254. 

 Haiiy [Geol.], 160. 

 Hawksbee [Physicist], 216. 

 Health (Physical and Moral), 18. 

 Heart (The), 21, 22. 

 Heat, Dynamical Theory of, 243. 



Latent, 173- 



Mechanical Equivalent of, 



243. 

 a Mode of Motion, 227, 247, 



257. 



Phenomena, 228. 

 produced by Friction, 227, 



228, 236. 



Heat, Radiant, 102, 239. 

 Rays, 206. 

 Solar, 239. 

 Specific, of Gases, 228. 



Heavenly Bodies, Composition of, 

 250. 



Heavens, Knowledge of the, 276. 



Heliocentric Doctrine (Solar Sys- 

 tem), 23, 26, 55, 58, 99, 193, 271- 

 272. 



Helium, 187. 



Helmholtz [Physicist], 213 (note), 

 222, 227, 241, 243, 246, 254, 255, 

 282. 



Helmont (Von), 60. 



Helvetius [Sociol.], 154. 



Hemisphere, 21. 



Henry IV. of Germany, 65. 



Henry VIII., 30. 



Henry (Prince), the Navigator, 54. 



Herbert (Dean), 138. 



Hero, 23, 215. 



Heroism of Mediaeval Inquirers, 50. 



Herophilus, 21. 



Herschel (Alexander), 253. 



Herschel (John) [Astron.], 210 ; 

 [Physicist], 229, 230. 



Herschel (W.) [Astron.], the " Co- 

 lumbus of the Heavens," dis- 

 covered and mapped Nebulae, 

 Double Stars, 204, 272. 



Hertz, 258. 



Hevelius [Astron.], 198. 



Hieroglyphics, 151, 230. 



Hildebrand, 48, 90 (note). 



Hincmar, 47. 



Hindus, 54, 137 (note). 



Hindu Syllogism, 10, n. 



Hipparchus, 24, 201. 



Hippocrates, Aphorisms, 20. 



Hirn [Physicist], 244. 



Hofmann [Chemist], Basis of Coal 

 Tar, Dye Industry, Molecular 

 Constitution, 186. 



Holland, 282. 



Hooke [Astron.], 199. 



Hooke [Physicist], Dial Barometer, 

 Interference of Light, Spiral 

 Spring, 218. 



