b-.833 
their bodies. That immenfe quan- 
tity of animal fubftances, and many 
others, which undergo a putrefac. 
tion by the warmth of the weather, 
feems to require an additional power 
or agent to counter-ac& it; and this 
office is deftined to the leaves. In 
frofty weather no animal fubftance 
is fubject to putrefaction, which 
cannot go on without a proper de- 
gree of heat. The perfpiration of 
animals is lefs offenfive in the Win- 
ter than in the -fimmer, and of con=_ 
feqtience “fh rupt the atmo. 
muft co 
{phere lefs, It feems therefore pro- 
bable, that, if we are deprived of one 
way by which air is corrected in the 
winter, we have alfo at that time lefs 
caufes which tend to contaminate 
our element. 
