34 -Dr. Pearson's Experiments and Observations 
V 
I shall next relate some experiments, made in order to ob- 
tain the acid sublimate of Scheele, or lithic acid of the new 
system of chemistry. 
•'>?$ 4 100 grains of an urinary concretion, which had been pre- 
viously found to contain principally the above animal oxide, 
were introduced into a tube - of an inch wide ; which was 
sealed at one end by fusion, and which also was fitly bent for 
collecting sublimate, and obtaining gaz. The sealed end was 
coated and exposed to fire, first to a low temperature, and gra- 
dually to a very elevated one. 
1 . Gaz was discharged, which had the smell of burning bone. 
2. Water appeared boiling immediately over the charge, 
which seemed to be burning, and was turned black. 
3. Gaz was discharged, of the smell of empyreumatic liquor 
cornu cerviy and about half a drachm of this liquor was in the 
upper part of the tube. 
4. A brown sublimate of carbonate of ammoniac appeared 
in the cold part of the tube; but in the hotter part, near the 
charge, was tar-like matter, and the gaz discharged had a very 
offensive smell of empyreumatic animal oil, with which was 
mixed that of prussic acid. 
The coated part of the tube was kept red hot, for some time 
after gaz ceased to come over. 
The quantity of gaz amounted to 24 ounces, by measure : 
it consisted of nearly 16 ounces of carbonic acid gaz, and the 
rest was air, with a larger proportion of nitrogen gaz than is 
contained in atmospheric air. 
vi«5 5. There was a residue of 30 grains, almost pure carbon; 
• 0 2i and 10 grains of heavy black and brown matter, a little above 
the coated part of the tube. In this last mentioned matter 
