O F 



COBALT, NICKEL, PLATINA, 



AND 



MANGANESE: 



WITH THE 



PRECIPITATES WHICH THEY AFFORD*, 



conflart necejfe eft 



Ex a/Us fj, tju* ntqutanl tonttrt'ier utujuam. 



LUCRF.T. 



I. Circwnjlances which fuggefled thefe experi- 

 ments. 



anceftors knew of eleven metals. To 

 thcfc the induftry of the pi-cient age has added 

 other lour : Cobalt, Nickel, Phtinu, and Man- 

 ganefe. Which were all firll examined with ac- 

 curacy, and diftinguiflied by their peculiar cha- 



raders, 

 * Vide N. Ada Acad. Succ. Vol. I. 1780. 



