2a 
in a gallon jar full of water, and as 
much ftrong inflammable air was 
let up as to fill above one third of 
the jar. I left it in the garden 
during fix days, when I found, to 
my furprize, that it was very far 
from being corrected; for one mea- 
fure of it, with one of nitrous air, 
ccupied 1.803 it gave the follow- 
ing iefate by Abbé Fontana’s me- 
thod, 2.58, 3.58: a chicken, near 
three weeks old, died in it in the 
fpace of one minute. 
This refult, fo different from the 
former, greatly puzzled me, and 
feftored my hope that the nitrous 
teft was without exception, and that 
T muft have committed fome error 
in the former experiment. 
I was, however, far from giving 
up entirely my fufpicion of the 
failure of the nitrous teft, I re- 
