604 



INDEX. 



Guericke (continued.) 



414; invents elec. machine, 395-6; 



treatise de Vacuo Spatio, 391. 

 Guilford, Lord, sells barometers, 



406. 



Guinicelli, poem of, 155. 

 Gunpowder ignited by elec'y, 497; 



lightning compared to explosion 



of, 570. 

 Guyot de Provins, 152. 



H. 



Hair, elec. attraction of, obs'd by 

 Boyle, 422. 



Hakewill, 384. 



Hale, Lord, on hydrostatics, 406. 



Halley, Dr. Edmund, 447. 



Hammering, magnetization by, 290. 



Hartmann, disc'y of dip, 209. 



Harpaga, 17. 



Hauksbee, Francis, 457 ; electric 

 machine, 461; exp'ts on elec. in- 

 duction, 467; on elec. light, 460; 

 on lines of force, 467; on lumi- 

 nous fountain, 459. 



Hausen, Christian August, 493. 



Healing by first intention, Browne 

 on, 381. 



Heat defined as mode of motion, by 

 Bacon, Boyle, Locke and Hooke, 

 417; destruction of magnetization 

 by, 227, 237. 



Hebrews, iron working by, 29. 



Heliades, legend of, 16. 



Helmont, John Baptist Van, 372. 



Henry, Prince, the Navigator, 194. 



Heraclea, 27. 



Heraclean stone, 24, 27. 



Herculean stone, 24, 27. 



Hero, 44. 



Herodotus on Thales, 34. 



Hesiod, amber mentioned by, 16; 

 brass mentioned by, 21. 



History of stones, Theophrastus', 



39- 



Hippalus, 104. 

 Hipparchus, 44. 

 Hippias, 35. 



Hoang-ti, legend of, 67; reign of, 65. 

 Hoar, Leonard, corresponds with 



Boyle, 425. 



Hobbes, attacks R. Society, 378. 

 Homer, amber mentioned by, 16; 



iron seldom mentioned by, 21; 



knowledge of compass attributed 



to, 54. 

 Hooke, Robert, 427; on elec. light, 



430; on heat as vibration, 417; in- 



ventions of, 428-9; phonograph 

 suggested, 429; spiral spring of, 

 429. 



Hopkinson, Thomas, 540. 



Horns, magnet termed bone of, 28. 



Huet, Bishop, on Solomon's voy- 

 ages, 55. 



Humboldt on Columbus, 200. 



Humor, elec. attraction ascribed to, 

 308. 



I. 



Iceland, discovery of, 113. 



Ida, Mt., mag. legend of, 19. 



Idean Dactyls, 22. 



Ignition, electric, 496, 507, 508. 



Inclination of compass, 210. 



Induction, electric, Gray's exp'ts 

 on, 477; Hauksbee's exp'ts on, 

 467; magnetic, Descartes on, 361; 

 Norman on, 219; of earth, 227; 

 Peregriuus on, 176; St. Augustine 

 on, 87. 



Inductive method, beginning of, 38; 

 compared with deductive, 356; 

 Gilbert's use of before Bacon, 330; 

 Nichol's definition of, 330. 



Innocent, Bishop, 566. 



Insulation, first use of term, 482; 

 Gilbert on, 308. 



Insulators, solid, used by Dufay, 

 482. 



Inunction, 130. 



Invisible College, 404. 



Ion of Plato, 24. 



lolinus on lychnites, 42. 



Iron, acquired magnetism of, 289; 

 age, 12, 20, 21 ; Aztec and Peruvian 

 ignorance of, 21 ; -clad ships, 

 Norse, 98, 112; decay of, in 

 Egyptian soil, 28; -filings in mag. 

 field, 50, 352, 412; food for mag- 

 net, 238; Hebrew knowledge of, 

 29 ; in ancient China, 73 ; in 

 ancient Egypt, 28, 58; mag. 

 screening effect of, 238 ; mag. 

 separation of, 159; mag. suspen- 

 sion of, 45; mentioned by Homer, 

 21 ; by Hesiod, 21 ; miners in 

 Samothrace, 23; mines, ancient, 

 22, 27; natural state of, 20; -ore, 

 Gilbert on, 287; Greek deposits 

 of, 25 ; workers, the first, 22 ; 

 working by Finns, 138. 



Irving, W., on Columbus, 201. 



Israelites as iron workers, 28. 



Italy, learning in in i7th cent'y, 

 342. 



