i o Vegetable Stanch . 
The furface of fiich human body is equal 
to 1 5 fquare feet, or 2160 fquare inches. 
The furface of the Sun-flower is 5616 
fquare inches, fo its furface is to the furface 
of a human body as 26 : 10. 
The quantity perfpired by a man in twenty 
four hours is about 3 1 ounces, as Dr. Keill 
found, vid. Medic . St at. Britan, p. 14. 
The quantity perfpired by the plant, in 
the fame time, is 22 ounces, allowing two 
ounces for the perfpiration of the beginning 
^and ending of the night in July , viz. after 
evening and before morning weighing, juft 
before and after night. 
So the perfpiration of a man to the Sun- 
flower is as 141 : 100. 
Abating the fix ounces of the thirty one 
ounces, to be carried off by refpiration from 
the lungs in the twenty four hours 5 (which 
I have found by certain experiment to be fo 
much if not more) the twenty five ounces 
multiplied by 437 4- the number of grains 
in an ounce Avoirdupois , the produfl: is 
10937T grains 5 which divided by 254, the 
number of grains in a cubick inch of water, 
gives 43 cubick inches perfpired by a man: 
Which divided by the furface of his body, 
viz. 
