INDEX 



universe to be a vast galaxy 

 of suns held to one centre, 

 iii. 22; thinks that all the 

 suns are "well supplied with 

 inhabitants," iii. 23; theory of 

 the Milky Way, iii. 24; thought 

 all the suns of a system would 

 be drawn together and de- 

 stroyed by impact, iii. 26; 

 suggests that the planets Ceres 

 and Pallas be called asteroids, 

 iii . 41; discovered that certain 

 fixed stars have changed their 

 relative positions, iii. 57. 



Hertz, Dr. Heinrich, discovered 

 the method now used in 

 wireless telegraphy, iii. 247 ; his 

 electro-magnetic theory of 

 light, iii. 280. 



Hevelius, Johannes, advanced 

 astronomy by his accurate 

 description of the face and the 

 spots of the moon, iii. 3. 



Hildanes, Fabricius, German 

 surgeon, ii. 183. 



Hinrichs, Professor Gustav, draws 

 attention to "law of octaves," 

 iv. 67. 



Hipparchus, demonstrated the 

 eccentricity of the sun's seem- 

 ing orbit, i. 234; his theory 

 absolutely consistent with all 



the facts, i. 235; exemplified 

 by a lantern on a cart-wheel, 

 i. 237; the dominant scientific 

 personality of his century, i. 

 238; demonstrated the pre- 

 cession of the equinoxes, i. 

 242. 



Hippocrates, the " father of 

 medicine," i. 174; his specula- 

 tions about the heart, i. 175; 

 his acceptance of the humoral 

 theory of disease, i. 176. 



Histological scheme, the, of Ger- 

 lach, iv. 281. 



Histology, the use of, iv. 113. 



Hoffmann, Friedrich, arranged 

 Boerhaave's doctrines in a 

 " system, "iv. 184. 



Holland, Philemon, his transla- 

 tion of the summary of Baby- 



285 



Ionian science by Diodorus, i. 



Honain ben Isaac, Arabian 

 physician, ii. 24. 



Hooke, Robert, ii. 215; his flying 

 machines, ii. 216; microscop- 

 ical observations, ii. 217, 298; 

 controversy with Newton, ii. 



2 37- 



Hooker, Sir Joseph, half-convert 

 to Darwin's views, iv. 171; 

 accepts Darwin's theories, iv. 



*74- 



Hopkins's estimate of the thick- 

 ness of the earth's crust, v. 



212. 



Howard, Luke, his paper on 

 clouds, iii. 182; his views con- 

 cerning the formation of dew, 

 iii. 183. 



Hughlings- Jackson, Dr., studies 

 of epilepsy, iv. 272. 



Humboldt, Alexander, his me- 

 moir on isothermal lines and 

 the distribution of heat, iii. 

 192; made practicable a truly 

 scientific study of compara- 

 tive climatology, iii. 194; called 

 our atmosphere an "aerial 

 ocean," iii. 195; his theories 

 about the Gulf Stream, iii. 196. 



Hunter, John, physiologist and 

 surgeon, iv. 78; his discovery 

 of lymphatics, iv. 80; his dis- 

 covery of the "collateral cir- 

 culation" of the blood, iv. 

 82 ; his operation for aneurism, 

 iv. 84; surgeon-extraordinary 

 to the king, iv. 86 ; his theories 

 of the action of gastric juices, 

 iv. 89; proved the action of 

 digestive fluid after death, 

 iv. 90, 91. 



Hunter, William, physician and 

 anatomist, iv. 77; his love of 

 controversy, iv. 78. 



Hutton, Dr. James, claims that 

 the face of nature is under- 

 going metamorphic changes, 

 iii . 1 1 8 ; the bases of the present 

 continents were laid in ancient 

 sea beds, iii. 119; the agency 



