INDEX. 



601 



Dioscorides on magnet, 92 ; on 

 ligurius, 42. 



Dioscuri, the, 23. 



Dip of magnetic needle, 209, 210; 

 Affaitatus' supposed disc'y of, 

 21 1 ; Gilbert on, 213; Hartmanu's 

 disc'y of, 209 ; Norman's disc'y 

 of, 215, 217. 



Drebbel, Cornelius Van, 44, 192. 



Dufay, Charles Francois. 478; broad 

 view of elec'y, 487; discovers vit- 

 reous and resinous elec'y, 484; 

 electrifies himself, 483; electrifies 

 metals, 479 ; exp'ts on colored 

 objects, 481; on distribution of 

 charge, 483; no distinction be- 

 tween electrics and non-electrics, 

 479; sends letter to R. Society, 

 485; recognition of Gray's work, 

 485; tribute to Gray, 487; uses 

 solid insulators, 482 ; verifies 

 Gray's exp'ts on conduction, 479. 



Du Tour on Nollet's theory, 554. 



E. 



Earth, field of force of, Gilbert on, 

 292; magnetism induced by, 227; 

 return circuit disc'd by Watson, 

 550. 



Eclipse at time of Thales, 34. 



Effluvium, electric, Cabseus on, 351; 

 Gilbert on, 308; magnetic, 292. 



Egypt, absence of Science in an- 

 cient, 31; iron in, 28, 58; lack of 

 amber in ancient, 52; mag. sus- 

 pension in, 45 ; opening of, to 

 commerce, 30; religion of ancient, 

 31; vending machines in ancient, 

 87. 



Egyptians, ancient, ignorance of 

 \nagnet of, 27; alleged knowledge 

 of compass by, 57; voyages of, 58. 



Electorius, 42. 



Electrical, first use of word, 339. 



Electric and magnetic motion com- 

 pared, 311; attraction, theories of, 

 307; attraction, Gilbert on, 308; 

 bell, inv'd by Gordon, 506; light, 

 see Light, electric; Machine, Gor- 

 don's, 506 ; Hauksbee's, 461 ; 

 Guericke's, 395 ; Winkler's, 506 ; 

 Motor, Gordon's, 507. 



Electricity and lightning, Frank- 

 lin's exp'ts on identity of, 580, et 

 seq.; Freke on identity of, 571; 

 Nollet on identity of, 573; Wink- 

 ler on identity of, 572; and mag- 

 netism linked by Newton with 



gravity, 439; atmospheric, De- 

 saguiliers theory of, 489; Frank- 

 lin's theory of, 576; beginning of 

 modern, 299; Boyle on mech'l 

 production of, 418; Digby on, 

 378; dual nature of, found by 

 Dufay, 484; and by Kinnersley, 

 586. 



First application to medicine, 

 501-2; first attempt to measure, 

 523; first book on, in English, 

 420; first distinguished from mag- 

 netism by St. Augustine, 89; first 

 notice of, by R. Society, 402; first 

 use of word, 373. 



Gordon kills animals by, 507; 

 Franklin's theory of, 643; Ger- 

 mans regard as fire, 492; Greene's 

 poetical references to, 369; Hau- 

 sen's theory of, 494; Jonson's ref- 

 erence to, 368; new theories of, in 

 1747, 5531 Quelmalz, theory of, 

 503; resinous and vitreous, dis- 

 covered by Dufay, 484; s'Grave- 

 sande's definition of, 488; speed 

 of, Lemonnier's attempt to meas- 

 ure, 532; Watson's attempt, 551; 

 Winkler's attempt, 506; Watson's 

 theories of, 507, 534. 



Electrics, and non-electrics, Dufay 

 on, 479; Bacon on, 325; become 

 non-conductors, 482; Boyle's ad- 

 ditions to, list of, 419; Eoyle ob- 

 serves mutual attraction of elec- 

 tric and rubber, 418; Browne's 

 exp'ts on, 381; Cabaeus' additions 

 to list of, 350; Descartes on, 364; 

 Gassendi on attraction of, 418; Gil- 

 bert's list of, 299; Gilbert on 

 nature of, 307; mutual attraction 

 of, obs'd by Acad. del Cimento, 

 433; naming of, 302; per se, 488. 



Electrida, 17. 



Electrides, 16, 17. 



Electro-magnetism, word coined 



by Kircher, 365. 



j Electrometer, first use of word, 524. 

 j Electron, 16. 



Electrum, in Egypt, 52; lake, 17. 

 i Elicott, John, elec. theory of, 554. 



Elizabeth, Queen, learning in time 

 o f , 33 2 -334; legacy to Gilbert 265. 



Emerson, R. W., on genius, 426. 



Emperor First, Chinese, 66. 



England in time of Elizabeth, 334; 

 in time of Hauksbee, 463. 



Ephesus, mag. suspension in temple 

 of, 46. 



