Analyfis of the Air. 193 
from nitre loft little of its dafticity, where- 
as moft of the air obtained from nitre, in 
diftilling with the receiver (Fig. 3 3 -) wa$ 
reforbed in a few days, as was alfo the air 
which was generated from deionized nitre 
in Experiment 102. Hence alfo we fee the 
reafon, why 19 parts in 20, of the air 
which, was generated by the firing of Gun- 
powder, was in 18 days reforbed by the 
fulphureous fames of the Gunpowder 5 as 
Mr. Hawksbee obferved, in his phyfico- 
mechanical Experiments, page 83. 
In the diftillation of Horn, it was obferv- 
able, that when towards the end of the ope- 
ration the thick foetid oil arofe, it formed 
very large bubbles, with tough unduous 
skins, which continued in that ftate feme 
time 5 and when they broke, there arofe 
out of them volumes of fmoak, as out of 
a chimney, and it was the fame in the di- 
ftillation of Muftard-feed. 
An account of some Experiments made 
on Stones taken out of human U- 
rine and Gall Bladders, 
H Aving procured, by the favour of Mr. 
Ranby , Surgeon to His Majeftfs 
O Houjhold, \ 
