t 4C8 ] 
to the touch, though perpetually furrounded with air 
hotter than their own bodies. Hence alfo, the human 
body keeps nearly its own temperature, in a flove heated 
to 324^: or may even pafs without injury into air heated 
to a much greater degree, according to the obfervations 
of DU HAMEL aiid TiLLETT, publiflied in the Memoirs 
of the Academy of Sciences to. On the other hand, 
ail thofe bodies which are powerful conducftors of fire 
from air, are influenced in proportion wdien furrounded 
wdth this medium. The bees wax melted from the mere 
contadl of the air in experiment viii; and in experi- 
ment VI, the albumen ovi was coagulated on the inter- 
vention of another body, which is a Itrong condudtor of 
fire from air. But whether this method of reafoning 
on the natural caufe of thefe effefls be juft or not, the 
final caufe is obvious, and is to be refolved into the wife 
and benevolent appointment of the Almighty. ]SIan is 
happily fo framed, as to pofTefs a power of keeping nearly 
the fame" tenor of heat, in all the variations of the tem- 
perature of the air in fummer and in winter, in hot and 
cold climates ; and confequently changes his fituation on 
the furface of the globe, with much lefs inconvenience 
or injury, than he could otherwife have done. The 
fame power likewife happily adapts different animals to 
their refpedfive deflinations. The lizard and the came- 
lion remain cool under the Equator, while the whale and 
porpoife retain a degree of heat above that of the human 
hody, though furrounded with the waters of the coldelf 
(c) Memoires pour 1761, 
4 
Northern 
