GENERAL INDEX 



theory exemplified by a lan- 

 tern on a cart-wheel, 1, 237; 

 the dominant scientific per- 

 sonality of his century, 1, 

 238; demonstrated the pre- 

 cession of the equinoxes, 1, 

 242. 



Hippocrates, the "father of 

 medicine," 1, 174; his specu- 

 lations about the heart, 1, 

 175; his acceptance of the 

 humoral theory of disease, 1, 

 176. 



Hirschovel, early English potter 

 who produced wares of super- 

 ior quality, 9, 232. 



Histological scheme, the, of 

 Gerlach, 4, 281. 



Histology, the rise of, 4, 113. 



History, Natural, to the Time of 

 Linnaeus, Chapter XV, 2, 297. 



Hoe, a modified form of the 

 lever, 6, 57. 



Hoe, Richard M., inventor of 

 the type-revolving machine, 

 8,127. 



Hofer, H., German experimen- 

 ter, proved that nitrogen 

 from the air can be made to 

 combine with oxygen in the 

 laboratory, 6, 306. 



Hoffman, Mr., in vented a rotary 

 engine, 6, 123. 



Hoffmann, Friedrich, arranged 

 Boerhaave's doctrines in a 

 "system," 4, 184. 



Holland, the type of diving-boat 

 most familiar to the majority 

 of people, 7, 107. 



Holland, Philemon, his transla- 

 tion of the summary of Baby- 

 lonian science by Diodorus, 1, 



Holland, P., success of the sub- 

 marine due to his efforts, 7, 

 105; the Holland type of 

 boat, 7, 107. 



Holmes, Sir George, his descrip- 

 tion of the voyage of the re- 

 plica of the Santa Maria, 7, 

 60. 



Honain ben Isaac, Arabian 

 physician, 2, 24. 



Honorius, public mills probably 



introduced in the Roman 

 Empire about the time of his 

 reign (384-423 A.D.), 6, 71. 



Hooke, Robert, 2, 215; his 

 flying-machines, 2, 216; mi- 

 croscopical observations, 2, 

 217, 218; controversy with 

 Newton, 2, 237; prone to 

 claim other men's discoveries, 

 8, 23 ; method of communica- 

 tion by telephone, 8, 68. 



Hooker, Sir Joseph, half -con- 

 vert to Darwin's views, 4,171; 

 accepts Darwin's theories, 4, 

 174. 



Hopkins' estimate of the thick- 

 ness of the earth's crust, 5,212. 



Hopkins and Rittenhouse in- 

 vented and sent up a balloon, 

 7, 237. 



Hornblower, Jonathan, invents 

 and patents compound en- 

 gine; the original element in 

 his idea, 6, 117. 



Horse, the worker par excellence, 

 domestic use of, 6, 59. 



Horse-power, origin of term, 6, 

 60. 



Hot Air Engine, Dr. Stirling's 

 efforts to invent, 6, 133 ; limi- 

 tations of, 6, 134; John Erics- 

 son's development of, 6, 134; 

 caloric engine of Svea, 6, 145. 



Houghton, George C., his de- 

 scription of the modern shoe 

 industry, 9, 108. 



Housatonic, the sinking of, by a 

 submarine, 7, 103 ; the attack 

 described, 7, 104. 



Howard, Luke, his paper on 

 clouds, 3, 182; his views con- 

 cerning the formation of dew, 

 3, 183. 



Howe, Elias, Jr., invents the 

 practical commercial sewing- 

 machine, 9, 93; struggles of 

 the inventor and final tri- 

 umph, 9, 95. 



Hudson, Henry, his heroic effort 

 to find the fabled northwest 

 passage, 7, 47- 



Hughes, Prof. D. E., his inde- 

 pendent invention of a coherer 

 of service in wireless telegra- 



[187] 



