So the feveral fore- 

 going perfpirations 

 in equal areas are, 



Vegetable Staticks. i\ 



depth perfpired in 12 hours day, viz. jfa 

 of an inch, 



( T 7rr m the vine in 12 

 ! hours day. 

 Ijo in a man, in aday 

 and a night. 

 ~j in a fun-flower, 

 in aday and night, 

 -^o in a cabbage, in it 

 hours day. 



T ^ T in an apple-tree, 



in 12 hours day. 



-\^ in a limon-tree, 



in 12 hours day. 



The area of the tranfverfe cut of the ftem 



of this Limon-tree was = 1 44 of a 



fquare inch ; hence the fap's velocity here, 



will be to its velocity on the furface of the 



leaves, as 1768 : 1 for 2 ** 7 x 10 °^ 17. 



144 



This is fuppofing the whole ftem to be a hol- 

 low tube j but the velocity will be increafed 

 both in the ftem and in 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 



