on the Composition of Urinary Concretions. 31 
vapour state, exhibiting white fumes, and sublimate, as above 
observed. 
The mode of making the experiments with the other acids 
was of course different from the former experiment. 
Experiment 11. Twenty -five grains of the above animal oxide, 
and half an ounce of water, were put into a bottle capable of 
containing three pints ; a stream of oxymuriatic acid gaz, from 
manganese and muriatic acid, was made to pass into the bottle, 
and upon the charge, for twelve hours ; and, for twenty-four 
hours more, oxymuriatic gaz kept issuing, but in smaller quan- 
tity, and circulating through the bottle. The oxide, by this time, 
was completely dissolved. Upon adding lime to a little of the 
solution of it, ammoniac was disengaged ; and, upon adding 
sulphuric acid, there was a disengagement of oxymuriatic acid. 
On evaporation, however, I obtained nothing but muriate of 
ammoniac, with which was mixed a little manganese. 
In this experiment, I could not doubt that the carbon had 
been carried off, in the state of carbonic acid, by the oxygen of 
the oxymuriatic acid; and thus ammoniac was compounded, 
from the union of the two remaining constituent parts of the 
oxide, viz. the nitrogen and hydrogen. The oxymuriatic acid, 
united to the ammoniac, parted with oxygen, and became mu- 
riatic acid during evaporation ; hence, muriate of ammoniac was 
formed. 
Experiment in. The above experiment was repeated, only 
the gaz was nitro-muriatic gaz, from a mixture of nitric and 
muriatic acids. The result was the same as in the last experi- 
ment, except that the product was a mixture of nitrate, and 
muriate, of ammoniac. 
