C 446 ] 
XLIIL Experiments on Animals and Vegetables, with re* 
fpeci to the Power of producing Heat, By John Hun- 
ter, F. R, S, 
Redde, June 22, ^ H E ingenious experiments and ob- 
fervations lately prefented to this 
learned Society, upon a power which animals feem to 
polTefs of generating cold, induced me to look over 
my notes of certain experiments and obfervations 
made in the year 1766, which indicate an oppolite 
power in animals; whereby they are capable of re- 
lifting any external cold while alive, by generating 
within themfelves a degree of heat fufficient to coun- 
tera<ft it. Thefe experiments were not originally infti- 
tiited in view of the difcovery, which in the event re- 
fulted from them, but for a very different purpofe; 
which was no other than to fatisfy myfelf, whether an 
animal could retain life after it was frozen, as had been 
confidently afferted both of fifti and fnakes. I men- 
tion this, to account for what might otherwife be attri- 
buted to negligence and inattention ; namely, that little 
nicety was ufed in meafuring the precife degrees of the 
cold applied in thefe experiments. Accuracy in this par- 
ticular was not aimed at, being of no confequence in the 
6 inquiry 
