jjS Union cf Cobalt with other Metals. [Book VI. 



cates to glafs. The following procefs is one of the 

 beft for feparating them when the cobalt is in con- 

 fiderable quantity : Saturate a folution of the roafted 

 ore in nitrous acid, and drop it into liquid volatile 

 alkali. The cobalt then is inftantly re-diflblved, and 

 affumes a garnet colour ; when filtered a grey powder 

 remains on the filter, which is the nickel. The 

 cobalt may be precipitated by any acid, 



