COBALT. 
Sp. 11. Acetite of Cobalt. 
ACEToUS ACID dissolves the oxide of cobalt with fa 
cility. The solution does not crystallize ; and when 
evaporated to dryness, soon deliquesces again. It has 
a fine red colour while cold, but becomes blue when 
heated *. 
Sp. 12. Oxalat of Cobalt. 
OXALIC AcID attacks cobalt, and converts it into a 
red powder, which is oxalat of cobalt. This salt is in 
soluble in water, but it dissolves in an excess of acid, 
and yields crystals. Oxalic acid precipitates an oxalat 
of cobalt from thé solution of that metal in most a 
cids f. 
The remaining salts of cobalt have not hitherto been 
examined. 
GENUS XVI. SALTS OF MANGANESE. 
ALL the properties of this genus of salts with which 
we are even at present acquainted were ascertained by 
Bergman and Scheele, by whose labours the oxide of 
manganese, one of the most important of all their in 
struments, was first put into the hands of chemists. 
The salts of manganese may be distinguished by the fol 
lowing properties : 
1. They are almost all soluble in water ; and the so- Characters. 
lution, when treated with fixed alkalies, deposites a 
white or reddish coloured precipitate, which very soon 
becomes black when exposed to the air. 
* Wenzel's Verwand. p. 194. 
t Bergman, i. 270. 
F2 
Chap. III.