[ 9 6 - 1 ' 
• • - ** / 
Experiment XCV. 
I included feveral frogs in glafs vei- 
iels filled with inflammable air. At firft 
they appeared not much incommoded by 
it, but fome hours after, became refllefs, 
were agitated, and endeavoured to get 
, V 
out. xXfterwards they were apparently 
quiet, but this ftate of repofe did 
not laft long. Their agonies recom¬ 
menced, as well as their efforts to efcape. 
In the midfl: of thefe alternations of agita¬ 
tion and tranquility, their force weakened, 
and they died. 
On cutting them through the body, I 
found that the motion of the heart was 
conflantly kept up. 
The flefh in general retained its na¬ 
tural colour. Sometimes it was rather 
red: however, one cannot with pro¬ 
priety affert, that this appearance is ow¬ 
ing to the addon of the gas, as I have 
feen 
