on the Protochloride and Peroxide of Mercury. 505 



For the examination of this body, an order of analysis si- 

 milar 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 ob- 

 tained 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 . . 3*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-gray 

 powder weighed 146*71 grains, corresponding to 95*66 per 

 cent. 



The liquor treated with nitrate of silver gave 44*03 of 

 chloride of silver, corresponding to 28*71 of chloride percent, 

 and which contains 7*08 of chlorine. 

 Thus we obtain, 



Mercury .... 85*117 or 88*98 

 Chlorine .... 7*803 8*15 



Other matters . 2*740 2*87 



95*660 100*00 



The mean of these experiments gives, 



Mercury .... 88*91 

 Chlorine .... 7*95 

 Other matters . . 3*14 



100*00 



B. — As the above method necessarily throws the chlorine 

 and mercury estimate rather too high, the following experi- 

 ment was made, in which the necessary loss produces an op- 

 posite effect : 



101*37 of the powder were boiled with strong muriatic acid, 

 Third Series. Vol. 1 1. No. 70. Dec. 1837. 3 T 



