KEY AND INDEX 



tion of "spontaneous varia- 

 tions," 4. 178; and the new 

 zoology, 6, 144-177; hismany 

 paintings, 6, 152; discoveries 

 of numerous species of radio- 

 larians, 6, 154; gastrula the- 

 ory of, 6, 155; his theory of 

 embryological development, 

 6, 156; great champion of 

 Darwinism, ibid.; his work 

 on morphology, 6, 157; lib- 

 erty of spirit accorded at 

 Jena, 5, 158; his laboratory 

 at Jena, 6, 159; his method 

 of work, 6, 161; his methods 

 of teaching, 6, 163; recog- 

 nized leader in the new zool- 

 ogy, 5, 171; his genealogical 

 tree regarding the ancestry 

 of man, 6, 172; man's line 

 of descent clearly traced by, 

 6, 176. 



Haeckel, Ernst, and the New 

 Zoology, Chapter VI, 6, 144. 



Hahnemann, Christian Samuel 

 Friedrich, the medical system 

 of, 4, 188. 



Hales, Stephen, father of vege- 

 table physiology, 2, 298; 

 study of the elasticity of air, 

 4 ? 1 1 ; described a process of 

 distilling coal, 6, 207. 



Hall, Charles M., discovered a 

 process for producing alum- 

 inum, 6, 300: 



Hall, Marshall, and physical 

 diagnosis, 4, 203; observa- 

 tions and reflex action, 4, 

 251-258. 



Hall, Thomas, exhibited a small 

 working-motor on a track 

 forty feet long, 7, 179. 



Haller, Albrecht von, 4, 73-75; 

 doctrine of irritability, 4, 74; 

 discoveries in embryology, 

 4, 75; first to use the watch 

 in counting the pulse, 4, 76. 



Halley, his observations on the 

 changes in the variations of 

 the compass, 3. 4; his ob- 

 servations on the transit of 

 Mercury, 3, 5; his discovery 

 of a method of determining 

 the parallax of the planets, 



ibid.; calculated the orbit of a 

 comet, 3,6; speculations con- 

 cerning meteors, 3, 7; 

 showed that fixed stars have 

 an actual or "proper" mo- 

 tion in space, 3, 57; showed 

 that the deviations of the 

 compass were due to some 

 influence having to do with 

 the problem of terrestrial 

 magnetism, 7, 10. 



Hallidie, Andrew S., the first 

 practical cable system made 

 by, 7, 177- 



Halske, his experiments with 

 electric motors, 7, 181. 



Haly, Abbas, author of The 

 Royal Book, 2, 24. 



Hamilton, Charles K., his flight 

 from New York to Philadel- 

 phia and return in June, 1910, 

 7, 298. 



Hamilton's, Sir William, collec- 

 tion acquired for British 

 Museum, 6, 5. 



Hammer, a modified form of the 

 lever, 6, 57. 



Hampson, Dr. William, im- 

 proved method of liquefac- 

 tion of gases, 6, 44; his ap- 

 paratus for liquefying air, 



T 6, 45- 



Hanaman, in connection with 

 Just, takes out patent for a 

 lamp with incandescent fila- 

 ment, 6, 235. 



Hand tools, modified forms of 

 the lever, 6, 57-59. 



Hansen, Christian August, in- 

 ventor of an electrical ma- 

 chine, 2, 274. 



Harets ben Kaladah, physician 

 of Mohammed, 2, 23. 



Hargreaves, James, the first 

 carding-machine invented by, 

 in 1762, 9, 16; inventor of the 

 spinning-jenny, 9, 21; first 

 patent taken out in 1770, 9, 23 ; 

 his description of his process 

 of spinning, 9, 23; difficulties 

 encountered in introducing 

 his machine, 9, 24. 



Harrison, John, inventor of the 

 first accurate watch, for which 



