4 





Vegetable Staitcks. 



2>T 



depth pcrfpired in 12 hours day, viz. &fe 

 of an inch. 



■■• 



* » . 





••: 





So the feveral fore- 

 going perforations 

 in equal areas are, 



j 



CTBi 



:::•:•• 





-i 



... 



f 1 vi in the vine in 12 

 I hours day. 



t- in a man, in a day 

 and a night. 



%i T in a Sunflower, 

 in a day and night. 



win a cabbage, in iz 

 hours day. 



1-5-7 in an apple- tree 

 in 12 hours day. 

 iTT-in a limon-trcc, 

 ■ v in iz hours day. 



The area of the tranfverfe cut of the ftem 

 of this Limon - tree was — r . 44 f a 

 fquare inch ; hence the Tap's velocity here , 

 will be to its velocity on the furface of the' 



leaves,as 1768: 1 for 2557 x ig° — I76ir 



144 ~ 

 This is fuppofing the whole ftem to be a hoi- 



low tube 5 but the velocity will be increafed 

 both in the ftem and the leaves, in propor- 

 tion as the pafTage 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 



