[ 102 ] 
Experiment CIII. 
PhlogilHcated air, or azotic gaz, is 
equally noxious to frogs with the nitrous. 
After death, the heart dill beats. Their 
fkfh is of a beautiful purple colour, as well 
as their blood. With regard to the move¬ 
ments, we obferve nearly the fame acci¬ 
dents as occur in the nitrous gas, except 
that the azota does not produce any change 
in the mufcles taken off by the animal. 
To prove this, 1 have held the legs of 
frogs for half an hour, and longer, in con¬ 
tact with this gas, and when I came to 
compare them with the others, did not 
find that they had been in the lead 
changed. 
The tlelh of animals as well frugivorous 
as carnivorous, and even that of filhes, 
furnifhes, on chemical analylis, a conlider- 
able quantity of phlogiflicated air. 
PhlogilHcated air appears to form, as it 
were, 
