Animals pojjefs of producing Cold 
Air. 
Dead frog. 
Living frog. 
In 1 
0 
7°l 
67I 
2 
102 
7 2 
68 
3 
I OCT 
72! 
69 1 
4 
100 
73 
70 
95 
8 1 1 
?8f 
The thermometer being introduced into 
the ftomach, the 
internal heat 
of the animals was 
found to 
be the fame with 
that at the furface. 
From hence it appears, that the living frog acquired heat 
more ilbwly than the dead one. Its vital powers muft, there- 
fore, have been a&ive in the generation of cold. 
To determine whether the cold produced in this inftance de- 
pended folely upon the evaporation from the furface, increafed 
By the energy of the vital principle, a living and dead frog 
were taken at 75 0 , and were immerfed in water at 93 0 , the 
living frog being placed in fuch a htuation as not to interrupt 
refpiration. 
Dead frog. . 
Living frog. 
a ■■ 
O 
C 
JL 
% 
8 1, 
2, 
88 1 
8 s; 
3 
90 1 
CO 
<4 
5 
9 'i 
89 
6 
91! 
89 
8 
9 1 f 
89 
Thefe experiments prove, that living frogs have the faculty 
<af refifting heat, or producing cold, when immerfed in warm 
water: and the experiments of Dr. fordyce prove, that the 
human body has the fame power in a. moift as well as in a dry 
* In the above experiment the water, by the cold frogs and by the agitation 
which, it buffered during their knmerfion, was reduced nearly to 91°!. . 
