hated ie 
Johnson and Chittenden—New Acid Ammonium Sulphates. 181 
Art, XIX.—On Schweitzer’s “New Acid Ammonium Sulphates ra 
by S. W. Jounson and R. H. Cuirrenpen. Contributions 
from the Sheffield Laboratory of Yale College. No. Ll. 
Dr. Paul Schweitzer, in a paper “On some New Acid Am- 
monium Sulphates, read before the American Chemical Society, 
July 6, 1876,* has given the results of some partial analyses of 
residues remaining after subjecting ammonium sulphate to 
several degrees of ignition, and has inferred: 1. That exposure 
to a heat a little higher than that of the boiling point of mer- 
cury converts ammonium sulphate into ammonium bisulphate 
with loss of one-half of its ammonia. 2. That a temperature 
somewhat below incipient redness occasions further loss of 
ammonia and sulphuric acid and leaves a salt of the formula 
(NH,),H,(SO,),. 3. That probably an intermediate salt is 
formed having the formula (NH,),H,(SO,), 
These conclusions are based on the fact that the residues of 
ignition at the temperatures named yield such percentages of 
SO, as the above formule require. We have repeated most 
of Dr. Schweitzer’s experiments, and so far as we have gone, 
have fully verified his observations. The formule which he 
deduces from his estimations of SO, are, however, inconsistent 
with the usually received atom-fixin wers of the elements 
involved, and we have made further investigation of the sub- 
stances to which he has called attention, in order to ascertain 
whether they are really exceptions to the laws of valence, and 
therefore possibly serviceable means of enlarging our generaliza- 
tions, or have a composition different from that which Dr, 
Schweitzer has inferred. 
and after fifteen minutes further igpinan “ted aap a = 
. urther heating at the same 
as the ignition is prolonged. second sample gave in the 
ee 
+ Made Pedigrees rg. —*, akc } onium carbonate, and analyzed 
With following results : 
Found, Calculated. 
60°70 60°60 
go 
(NH,),0 39°28 39°39 
