Vegetable Stanch. 1 1 
viz. 2160 fquare inches, the quotient is 
T Vpart of acubick inch perfpired off a fquare 
inch in twenty four hours. Therefore in 
equal furfaces and equal times the man per- 
fpires -rs-, the plant or as 50 : x 5, 
Which excefs 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-ambient air, 
which heat in fummer is from 25 to 35 de- 
grees above the freezing point, (vide Exp , 
20.) but the heat of the warmed external 
parts of a man’s body is 54 fuch degrees 5 
and the heat of the blood <54 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 
fufficient to make a plentiful evaporation. 
Qu. Since then the perfpirations of equal 
areas in a man and a Sunflower, are to each 
other as 165 : 50, or as 3v : 1 3 and fince the 
degrees of heat are as 2 : 1, mud not the fum 
or quantity of the areas of the pores lying 
in equal furfaces, in the man and Sunflower, 
be as 16 : 1 ? 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 
faken together. Dr, 
