90 



LOSS COMPARED 



[CH. IV 



piece of known area. If the plant has leaves of various 

 sizes, the leaves are classified into two or three sizes, and 

 the area of one of each heap is taken. If the amount 

 of stem or branches is considerable an estimate should 

 be made of the area of these, and the amount added to 

 the area of the leaves. 



(115) Loss of weight compared with absorption. 



To demonstrate that the loss of weight is roughly 

 equal to the amount of water absorbed by a cut branch. 



Fio. 16. Exp. 115. • 

 select a branch of Portugal laurel which has no young 



