Vegetable Statich. \ \ 
wz. 2.160 fquarc inches, the quotient is 
I- part of a cubick inch perfpired off a fquare 
inch in twenty four hours. Therefore in 
equal furfaces and equal times the man per- 
fpires the plant Ary or as 50 : 15. 
Which cxcefs in the man is occafioned 
by the very different degrees of heat in each : 
For the heat of the plant cannot be greater 
than the heat of the circum-ambienc air, 
which heat in fumnier is from 25 to 35’dc. 
grees above the freezing point, Exp. 
20.) but the heat of the warmeft external 
parts of a man's body is 54 fuch degrees; 
and the heat of the blood 64 degrees ; 
which is nearly equal to water heated to 
fuch a degree, as a man can well bear to hold 
his hand in, ftirring it about ; which heat is 
fuificient tp make a plentiful evaporation. 
Since then the perfpirations of equal 
areas, in a man and a Sunflower, are to each 
other as 165 : 50. or as af : i> andlince the 
degrees of heat are as 2 : i, muft not the fum 
or quantity of the areas of the pores lying 
in equal furfaces, in the man and Sunflower, 
be as 1 6 ; I > for it feems that the quantities 
of the evaporated fluid will be as the degrees 
of heat, and the fum of the areas of the pores 
taken together. i Dr*, 
