RESEARCHES ON THE AMMONIAC AT. COMPOUNDS. 101 
entering into its composition. For, as the products are calo- 
mel, ammonia, nitrogen, and watery vapor, we have all the 
data necessary for the purpose ; the calomel giving the amount 
of chlorine and mercury, while the ammonia, nitrogen, and 
water will give the ammonia and oxygen, or the amidogen and 
water, entering into its composition. The result of 4 experi- 
ments gave, as a mean, 
Calomel, 92.98 or Hg 79.14 
CI 13.84 
NH 3 3.87 
N 2.19 
HO .58 
Loss .38 
100 
The value of the mercury may also be obtained by the pro 
cess of reduction, the solution in hydrochloric acid being act- 
ed on by protochloride of tin, and the resulting mercury weigh- 
ed. The mean of two experiments gave, 
Hg 77.7 per cent. 
The decomposition of the hydrochloric solution, by sulphu- 
retted hydrogen, afforded also results by which the amount of 
mercury and ammonia could be estimated. The resulting 
precipitate of bisulphuret being carefully dried and weighed, 
and the solution from which it was deposited being evaporated 
to dryness, and the hydrochlorate of ammonia weighed, gave 
data from which it was estimated that 100 parts of ^the preci- 
pitate yielded 
Hg 77.96 
NH 3 7.06 
Heating white precipitate with a solution of sulphuret of 
barium, and passing the resulting vapor of water and the am- 
monia into a dilute solution of hydrochloric acid, a solution of 
