22 Experiments and Observations on 
specific gravity. ‘They were then analyzed 
by lime water; they all required the same 
quantity to saturate them and_ yielded equal 
quantities of carbonate of lime; the am- 
monia was saturated by test sulphuric,acid, 
and they again agreed in the quantities. of 
acid required; so that the residuary salts in 
all the three samples were of the same qua’ 
lity in every respect. 
As the carbonate of ammonia may, from 
the method in which it is formed, be suspect- 
ed to contain sometraces of sulphate or mu- 
riate of ammonia, I was careful to try the 
last mentioned solutions by the usual tests; 
but I could scarcely detect any portion of 
either sulphuric or muriatic acid. The salt 
may therefore be considered purely a com- 
pound of carbonic acid and ammonia, toge- 
ther with some portion of water. 
From the above experiment, proving that 
all the three samples of carbonate of ammo- 
nia were ultimately reduced to the same pure 
salt, it is strongly to be presumed that they 
were originally the same, and that the differ- 
ences observed were to be ascribed to the 
effects of greater or less exposure to the at- 
mosphere by reason of their different ages 
and other circumstances.—However this may 
be, it is evident, that no agreement can be 
