HALOID COMPOUNDS OF SILVER, MERCURY, LEAD, AND COPPER. H43 
According to Schiff the specitic gravity of the octohedral iodide is 5*91, while 
Karsten makes it 6*2009, and Boullay 6*320. 
Two distinct specimens with which we worked gave respectively— 
(1) 6*3004 
(2) 6*2941. 
The specific gravity of the fused iodide was 
to he— 
found by the method before described 
5*2865. 
Thus the specific gravities corresponding to the five marked conditions shown in the 
curve table are as follows :— 
Specific gravity at 0° C.__.=6‘297 
» 5 , 126° C. (octoliedral condition).= 6-276 
3 j » „ (prismatic condition).= 6-225 
v „ 200° C. solid.= 6-179 
»> » „ liquid.=5-286 
In the above experiments on the di-iodide of mercury 1 have to acknowledge the 
assistance of Mr. H. M. Elder, at that time a pupil in Marlborough College. 
MDCCCLXXXII, 7 G 
