328 W. Gibbs and F. A. Genth 
and crystallizes in a great measure from the solution on cooli 
Chlorhydric acid and alkaline chlorids precipitate it unchanged. 
When boiled with sulphuric acid, the salt gives off abundance 
of chlorhydric acid gas, but it is difficult to drive off all the acid 
without decomposing a portion of the resulting sulphate. The 
salt is slowly Dac sisest by boiling ammonia, chlorid of am- 
monium, and a dark-brown oxyd of cobalt being the only pro- 
ducts of the decomposition which we have been able to detect. 
Reducing agents in general act upon this salt as upon chlorid of 
Roseocobalt and Purpureocobalt. We have not yet, however, 
been able to obtain with the chlorid of Luteocobalt compounds 
analogous to those which are produced by the action of sulphur- 
ous acid and deutoxyd of nitrogen upon the chlorids of Roseo- 
cobalt and Purpureocobalt, although we have repeatedly made 
the attempt. 3 
The chlorid of Luteocobalt is dichrous. In the dichroscopi¢ 
lens the ordinary image is pale violet, while the extraordinary 
i is orange-violet. The color of the salt, in coarse powder, 
approaches the orange-yellow of the first circle, but the color of 
als could not be defined by the chromatic scale, 
which we employed. Chlorid of Luteocobalt exhibits a remark- 
able tendency to form chloro-salts with metallic chlorids. These 
salts are formed with great ease, by the direct union of the two 
chlorids, and are worthy of notice for their stability and capacity 
of crystallization, Of these salts, which are very numerous, We 
have examined only the compounds with gold and platinum. 
The analyses of chlorid of Luteocobalt lead to the formula 
6NH3.CozCl 3, 
0-2036 grs. gave 0°1180 grs. of sulphate of cobalt == 22-05 per cent cobalt. 
0°3350 grs, gave 0°1988 grs, : owe : 
05110 grs. gave 0°2970 grs. iY “= 2211 
The chlorid of Luteocobalt is readily soluble in boiling water, 
“ “ 
grs, - « =2902 “ Tx. 
0°2942 grs. gave 04723 grs. chlorid of silver = 39°67 per cent chlorine. 
Pi grs, “ “ = 3 “ 
0°3902 grs. gave 0°2346 grs, water = 6°68 per cent hydrogen. 
04617 grs, gave 02800 grs. . = 6 * . 
0°7305 grs. gave 200% c.c. of nitrogen at 21°5 ©. and 765m™80 (t =22°2 C) 
Comparing these with the calculated results, we have 
Eqs. Theory. Mean. Found. 
It, 2 59:0 22°06 22-05 22°05 
Chlorine, 3 1065 39°79 39°73 39°68 
8 
Hyd 18 180 6.73 6°70 668 
Nitrogen, 6 840 3142 3141 31°49 
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