[ 126 ] 
centrating and preferving it, although 
placed in a medium much below thesr 
temperature; and they have likewife a 
power of generating cold when the fur¬ 
rounding medium is confiderably above 
their natural heat. 
There is then in bodies, which enjoy 
life, a principle which regulates their tem¬ 
perature according to the neceffity of the 
cafe. And why fhould there not be a 
principle, or force, to accumulate and con- 
den fe eletflricity ? 
It may be objected, that when an 
animal is placed in a cold medium, it de- 
compofes by the procefs of refpiration a 
larger quantity of air, and confequentlv a 
greater quantity of caloric is ab forked by 
the blood. That in animals placed in a 
medium, the temperature of which is 
above the ftandard of their natural heat, 
the evaporation from the furface increafes, 
and the quantity of inflammable principle 
7 '' ' ' 7 
m 
