6oo 



INDEX. 



Compass (continued.) 

 to various ancient people, 53; Azi- 

 muth, 181; boxing the, 187; Chin- 

 ese, first marine, 189; Chinese 

 obs'n of variation of, 76; Colum- 

 bus' alteration of, 196; Columbus' 

 disc'yof variation of, 200; Colum- 

 bus' theory of, 199; derivation of 

 word, 133; design of card, Etrus- 

 can, 60; De Vitry on, 154; dip or 

 inclination of, 210; disc'y of dip 

 of, 209; early Spanish, HI; errors 

 in Columbus', 201; evolution of, 

 131; Finn, 140; first des'n of, 128; 

 garlic effect on, supposed, 143; 

 Gilbert on storage in meridian, 313; 

 Gilbert's electroscope resembles, 

 304; governed by earth's poles, 

 277; Guyot de Provins on, 153; in 

 time of Peregrinus 179; Lullycu, 

 191; Neckam's des'n of, 128; non- 

 mag, metal in, 183 ; Norman's 

 disc'y of dip, 2:5; Norse penalty 

 for falsifying, 144; not Chinese 

 inv'n, 85; not derived by Arabs 

 from Chinese, 105; old mode of 

 using, 130; Peregrinus', 180; Porta 

 on protecting needle of, 238; pun 

 ishrnent for tampering with, 144; 

 secular variation of, 446; sugges- 

 tion of telegraphy by, 239; tele- 

 graph, Schwenter's and others', 

 382; unknown to Saracens, 109; 

 variation of, 196; William the 

 Clerk's poem on, 150 ; Wisbuy 

 origin of, 146. 



Condenser, Franklin's plate, 556. 



Conduction, electric discovered by 

 Guericke, 399; magnetic, Gilbert 

 on, 289. 



Conductor, Desaguiliers proposes 

 name, 488; magnetic, first sug- 

 gestion of, 47; prime, inv'd by 

 Bose, 496; or non-electric, 482. 



Constantine, law of, concerning 

 lightning, 566. 



Convection, electrical, 545. 



Copernican theory, 267. 



Copernicus, Nicolas, 267. 



Cornier shocked by lightning, 588. 



Corrichterus, his mag. unguent, 37. 



Corybantes, 23. 



Cowley, poem on R. Society, 413. 



Creagus, 159. 



Creation, prehistoric account of, 164. 



Crows, as guides at sea, 113. 



Ctesias, suggestion of lightning pro- 

 tection, 565. 



Cunaeus, inv'n of Leyden jar as- 

 cribed to, 521. 



Curetes, 23. 



Current, first suggestion of mag- 

 netic, 47. 



D. 



Dactyls, Idean, 22. 



Balance, treatise on magnet, 448. 



D'Alibard translates Franklin's pa- 

 pers, 587 ; exp'ts on lightning- 

 rod^ 588. 



Dantzic, philosophers, exp'ts of, 

 514; physical society of, 513. 



De Augmentis, criticisms of Gilbert 

 in Bacon's, 328. 



De Beauvais. See Beauvais. 



De Bercy. See Bercy. 



De Boodt. See Boodt. 



De Buffon. See Buflbn. 



De Fantis. See Fantis. 



De la Hire. See La Hire. 



De Lor. See Lor. 



De Magnete, Bacon's "remains" 

 taken from Gilbert's, 325. 



De Monmor. See Monmcr. 



De Natura Rerum, Lucretius' poem, 

 47; Neckam's treatise, 123. 



Denmark, Iron Age in, 21. 



D'Epinois, Gautier, poem of, 156. 



Desaguiliers, Dr. Joseph, 470; exp'ts 

 of, 488 ; on atmospheric elec'y, 

 489. 



Descartes, Rene, 356 ; copied by 

 Digby, 378; magnetic theory, 359; 

 mag. theory compared with that 

 of Plutarch, 51; method compared 

 with that of Bacon, 356; on elec- 

 trics, 364; on mag. spectrum, 362; 

 theory abandoned in France, 510; 

 theory compared with that of Lu- 

 cretius, 48; vortex theory of, 357. 



De Subtilitate, Cardan's work, 246. 



Diamond, alleged attraction of, by 

 iron, 281; alleged magnetism of, 

 238; alleged screening effect, 88. 



Diaz, Bartholomew, voyage of, 205. 



Digby, Sir Kenelm, 376; elec. the- 

 ories of, 378; replies to Browne, 

 380. 



Digges, Madam, her sparkling frock, 

 425. 



Digges, Sir Dudley, 339. 



Digges, William, letter concerning 

 Mrs. Sewall, 425. 



Diocles, 41. 



Diogenes Laertius, 34. 



Dionysius, 59. 



