

THE 



INDEX 



ACIDULiE, «,W 

 deriving, Page 326 

 Alcali, in /firings, 328 



feqq. /$ UA&rf owing, 330 

 feqq. 

 Antimony, ttwo/, 47. ii&w 

 formed, 98 



Arfenic-huts, ™£^, 181 

 Arfenic-pyrites, what, 19. 

 Dijfolve not in the air, 205 

 Arfenic, <?^&7i of, on metajs, 

 30. i/aw procured from 

 its mineral, 341 



Arfenic in pyrites, 169 feqq. 

 Refembles a white metal, 

 169. Is fugitive in the 

 fre, ib. Turns black in 

 the air, 170. Is a femi- 

 metal, ib. Forms of, ib. 

 Blacknefs of, to what ow- 

 ing, 171. Wl)y called 

 fiy-Jlone, ib. In a pow- 

 dery form highly fubtle, 

 472. Colour: of, to what 



owing, 172. Powdery 

 form of how procured* 

 173. Reguline form of 

 how obtained, ib. Fluxes 

 with any thing capable of 

 retaining it, 178. By 

 what fixed, 179. White 

 cryflalline, what, 1 8 1, 

 Blacknefs of, with-held by 

 quickftlver, 182. Partly 

 transparent, ib. Lofes its 

 tr an/par ency in the air, ib. 

 Turns of a milky colour, 

 182 feqq. May be a cal- 

 cined metallick body, 183. 

 Yellow cryflalline, what, 

 ib. Red, what, 183. 

 How made, 185. Regu- 

 lus of, how procured, 186. 

 Corrodes glafs, ib. Vi- 

 trifies with lead, ib. Vi- 

 trified, proves a flrong 

 flux, ib. Origin of arfe- 

 nick, 198 Found native 

 in the earth, 199. IVants 

 not a gnat dial to become 



