Vegetable Stanch. \\ 



depth pcrfpircd in 12 hours day, viz. ~tj 

 of an inch. 



" iJi in the vine in 12 

 hours day. 

 T V in a man, in a day 

 and a night. 

 itt in a Sunflower, 

 in a day and night, 

 -r? in a cabbage, in 1 2 

 hours day. 

 1^? in an apple-tree,, 

 in 12 hours day. 

 2 ~ in a limon-tree, 



^ in 12 hours day. 



So the feverai fore- 

 going perfpirations 

 in equal areas are, 



The area of the tranfverfe cut of the ftem 

 of this Limon-tree was = 1 . 44 of a 

 fquare inch 5 hence the fap's velocity here 3 

 will be to its velocity on the furface of the 



2557 X 100 



leaves, as. 1768 : 1 for 



144 



1768* 



This is fuppofing the whole ftem to be a hol- 

 low tube 5 but the velocity will be increafed 

 both in the ftem and the leaves, in propor- 

 tion as the paffage of the fap is narrowed by 

 the folid parts. 



By comparing the very different degrees 



of perfpiration, in thefe 5 plants and trees, 



C 3 we 



