Experiments and Otfer-vations on Shell and Bone. 355' 



the vitriolic acid ; the fulphur is difengaged of a citrine co- 

 lour, and the arfenic under the form of a white calx. The 

 calcined metallic vitriol remains in the retort. By this pro- 

 eefs I obtained from fulphurous and arfenical cobalt ore. 

 White calx of arfenic - 36 



Citrine-coloured fulphur - J^ 



Thefc fubftances fervcd to mineralife the cobalt, to give it 

 the property of efHorefcing into vitriol of cobalt in a moid 

 place. This fait is foluble in water; and in this it differs 

 from the lilac-coloured arfenical efflorefcence of cobalt. 

 Having treated in the f^ime manner ore of nickel *, there 

 pafled over fulphurous acid, citrine-coloured fulphur, and. 

 white calx of of arfenic : there rcuiained in the retort green 

 calx of nickel in part vitriolated. The fulphurous and arfe- 

 nical ore of nickel which I employed had no matrix, and 

 was covered with an efflorefcence of a dirty green colour : 

 its internal tiflue was gray inclining to red, It produced per 

 quijital. 



Sulphur - - 3 . 



Arfenic - - 2^ 



Nickel _ - 75 



X. Experiments and Obfervalhvs on Shell and Bofie. By 

 Charles Hatchett, Efq. F.R.S. 



X 



[Concluded from Page 29.] 



HE bones of fifli, fuch as thofe of the falmori, macka-, 

 rel, brill, and Ikate, afibrded phofphat of lime; and the only 

 difference was, that the bones of thefe fifh appeared in gene^ 

 ral to contain niore of t!ic cartilagiAous fub(t^i:^ce relative tq 



following note: — " Le mctallifiteur eft congcncrc des liuil'js, dcs graiHts ; 

 c'cft le mime aciditm puifque faturg de phlogiftique et combine avec moins 

 d'eau ; c'eft le mcme acide qui eft combine avec les tcrrcs meta'.liques, qui 

 forme les fels qu'on nomme chaux mctalliques." 



• The cuprum niccoli of the French. Niccolum WalUriu This cele*. 

 liratcd mineralogift fays, " Whence the mineral nickel acquired its name is 

 ^n«rtaio. ^licktl, perhaps, fignilies the fame thin^ as fpurious or falle^*' 



^35 ^% 



