206 Journal of the Asiatic Society of Bengal. [June, 1913.] 
the iodine and mercuri-periodide comes out as a precipitate in 
double combination. 
TETRAPROPYLAMMONIUM MERCURI-PERIODIDE. 
5N (C;H,), I, HgI,. 
The solution of mercuric iodide and iodine was prepared 
by dissolving weighed quantities in potassium iodide and the 
mo- 
nium iodide. The precipitate thus obtained was triturated in 
a mortar with the mother liquor, filtered and washed with a 
small quantity of water, since on the addition of a large quan- 
tity the salt decomposes with the liberation of iodine, as ob- 
served in the case of double cupric iodides. The precipitate 
was dried in a desiccator over sulphuric acid and had a brown 
colour. 
The salt on analysis gave the following results :— 
0°3631g gave 0:0308 HgS; Hg=7'48 
0°1190g gave 0°1195 Agl; I1=54-29 
Calc. for 6N (C,H,),I, HgIl,; Hg=7°91; 1=55°28. 
mercuric iodide, having a formula 2N(C,H,),I, HglI,. The 
decomposition that takes place might be represented thus :— 
5N(C;H,),1, HgI, = 2N (C3H,),, HgI, + 3N(C;H,),I + 21, 
We are at present engaged in preparing a series of double 
mercuri-periodides with various substituted ammonium bases 
and also other persalts by similar methods. 
e take this opportunity to express our best thanks to 
Professor P. C. Ray for his kind encouragement. 
POLONIA GER PL RPT OG 
