442 Professor Kane on the Action of Ammonia 
cury, the decomposition being accompanied with that sort of effervescence which 
appears in the heating of so many of the substances under examination. 
For the examination of this body, an order of analysis similar to that adopted for 
white precipitate was pursued. 
A.—148, 15 grains of precipitated calomel were boiled for some minutes with a great 
excess of water of ammonia, and the whole thrown on a filter. ‘The black powder 
thus obtained weighed 141,92 grains corresponding to 95,79 grains from 100 of 
calomel. 
The liquor that had been filtered off was acidulated by nitric acid and nitrate of 
silver added in excess ; the chloride of silver precipitated was collected and dried : it 
weighed 44,44 grains corresponding to 30,0 from 100 of calomel; and the 30,0 
grains of chloride of silver containing 7,401. But calomel consists in 100 parts of 
Mercury 85,117 
Chlorine 14,883 
Therefore we have by this experiment, the black powder composed of 
Mercury 85,117 and 88,85 
Chlorine 7,482 7,76 
Other matters $8,191 : 3,39 
95,790 100,00 
No. 2.—153,36 grains of calomel were boiled with water of ammonia for a few 
minutes, and filtered. The dry dark-grey powder weighed 146,71 grains, correspond- 
ing to 95,66 per cent. 
The liquor treated with nitrate of silver gave 44,03 of chloride of silver, corre- 
sponding to 28,71 of chloride per cent. and which contains 7,08 of chlorine. 
Thus we obtain, 
Mercury 85,117 or 88,98 
Chlorine 7,803 8,15 
Other matters 2,774.0 2,87 
95,660 100,00 
The mean of these experiments gives, 
Mercury 88,91 
Chlorine 7,95 
Other matters 3,14 
100,00 
