110 J. P. Cooke—Atomic Weight of Antimony. 
must depend on the extraordinary attraction of this substance 
for moisture. Before, however, fully following out the clew 
thus obtained, we made a similar study of the iodide of anti- 
mony. 
The iodide of antimony was prepared like the bromide, by 
shaking up in a glass flask a solution of iodine in bisulphide of 
carbon with finely pulverized metallic antimony. On filtering 
and decanting, after the color of the iodine is discharged, a 
solution having a pale greenish-yellow color is obtained, from 
which on cooling or on evaporation red crystals of iodide of 
antimony are deposited. The substance may be purified by 
recrystallization from the same solvent; but iodide of anti- 
mony is far less soluble in bisulphide of carbon than the chlo- 
ride or bromide, and cannot therefore be so advantageously 
treated in this way, nor can tbe small amount of carbonaceous 
impurity which the crystals acquire from the solvent be so 
easily rem . Moreover, iodide of antimony cannot be so 
readily distilled as the chloride or bromide, on account of its 
high boiling point, which is above that of metallic mercury. 
But another property of iodide of antimony which, so far as 
ful phenomenon. So also when the greenish-yellow solution 
(above described) of the iodide in bisulphide of carbon is ex- 
1 tothe air and light, it rapidly becomes colored red f 
