on the Ammonia-cobalt Bases. 257 
saan epg but of the other similar bases, may give differ- 
ent oxyds by decomposition. We propose to examine this point 
more fully fancadhons : aot sen 
The hydrate above mentioned and analyzed is a very dark- 
brown pasion, which dries to a black mass with a gummy lus- 
tre. The powder is dark brown. Oxalic acid dissolves it to a 
drous oxyd occurs in. the form of small steel-gray octahedra, 
‘tric, chlorhydric, and nitro-muriatic acids have no decided ac- 
tion upon them. 
16425 grs. of this oxyd gave 1-2059 grs. of metallic cobalt = 73:41 per cent. 
gs. ignited in sede 
16425 ogen gave 0°4879 grs. water = 25°91 per cent oxygen. 
The formula CosO« requires 
Eqs. Calculated. Found. 
Cobalt, - - 8 88'5 13°44 7341 
Osygen, 3 See § 320 26°56 25°01 
1205 100:00 99°32 
0 
until the chlorine is expelled. It is, therefore very probable that 
in the decomposition of chlorid of Roseocobalt by heat, the chlo- 
Tid of cobalt is first produced, and then decomposed in the man- 
e 
Solutions of the ammonia-cobalt bases by sulphid of ammonium, 
it can scarcely be doubted that this is the bisulphid, as Claudet’s 
PURPUREOCOBALT, 
The salts of Purpureocobalt are often found among the direet 
oduets of the oxydation of ammoniacal solutions of cobalt. 
me =o ae often formed from the salts of “ergata by ss 
.>Y boiling with strong acids, the cobalt passing, as we con- 
“élve, from one Rare toanother. The salts of Purpureo- 
SECOND SERIES, VoL. XXIII, NO. 63.—MARCH, 1967. : 
33 
