on the Haloid Compounds of Mercury. 435 
Expt. Yellow powder. Chlorine in liquor. 
1 83,5 19,25 
2 83,3 18,50 
3 84,7 18,90 
mean 83,83 18,89 
Now 100 of sublimate, contain 
Mercury 74,09 
Chlorine 25,91 
Hence we see that there have been abstracted from the sublimate three-fourths of 
its chlorine ; the remaining fourth, and all the mercury, existing in the yellow powder. 
We have therefore in 83,83 parts of it— 
Mercury 74.09 
Chlorine 71,02 
Or in one hundred parts, 
Mercury 88,381 
Chlorine 8,374 
B.—When white precipitate already prepared is boiled with water, there is ob- 
tained a similar yellow powder, and the supernatant liquor is found to contain only 
sal-ammoniac. As we know, within very strict limits, the composition of the white 
powder, we can make use of this reaction to illustrate the nature of the yellow 
product : 
100 parts of white precipitate were boiled with water until completely converted 
into the yellow powder ; the liquor, which was quite neutral, was acidulated ; and the 
chlorine dissolved precipitated as chloride of silver, from which its quantity was ob- 
tained by calculation. The following table gives the results of experiments conducted 
in this manner :— 
100 of white precipitate gave— 
Expt. Yellow powder. Chlorine in liquor. 
1 90,00 5,93 
2 88,50 6,50 
3 90,30 6,40 
mean 89,60 6,29 
But 100 of white precicipate contain 
Mercury —_78,60 
Chlorine 13,85 
