of the Metals of the Magnesuim Group. 248 
Cobalt. piriaee bose oe! anhydrous cobaltous chlorid was pre- 
pared by igniting chlorid of purpureo-cobalt. The chlorid was 
then precipitated by oxalic acid and alcohol, collected on a san 
filter and digested with a sulphuri The solution 
took its iw * In this 
0°4292 gr. CoCl, ee 47°8 c.c. RE = 45°30 pr. ct. 
0°3657 or. CoCl, required 40°8 c.c. hypermanganate = 45°37 pr. ct. 
Co. 
for about half an placing the alcohol as fast as it evap 
orated. The paerrrs ius foal riggs on a paper filter, and, after 
washing, dissolved in e filter. The was 
charged by a ae a of cobaltous eat In this manner: 
0°9585 gr. Pata Peep ae required 42-2 c.c. hypermanganate 
me 
1°0287 37 gr. aidkelous s eulphate required 45°3 c.c. hypermanganate 
The en sn. + 6H,O requires 28-24 pr. ct. NiO (Ni = 
58), but it is very difficult to obtain the sulphate in a perfectly 
definite state of hydration. 
anganese.— Although manganese is completely precipitated 
from its soluble salts by oxalic acid in the presence of alcohol, 
my results with the method have not been satisfactory, owing 
as I suppose to my not having a definite salt for analysis. The 
following analyses show at any rate that closely corresponding 
results can be obtained when the same substance is taken : 
0°3760 gr. manganous oxalate required 30°50 c.c. hypermanganate 
= 38°38 pr. ct. MnO. 
0°4013 aA pice ars required 32°55 c.c. hypermanganate 
8°38 pr. 
pr. ct. 
* Compare, as regards this method, W. Gibbs, in this Journal, vol. xiv, p. 204. 
