HOW PLANTS GIVE OFF WATER 95 
film on the inner surface of the jar covering the leaves. 
In fifteen or twenty minutes more it will be seen that 
this is water, for it 1s accumulating in small drops 

Fic. 130. To show loss of water from leaves, the leaves just covered. 
which become larger as the experiment continues. 
The other jar is dry. The water, then, which first 
formed the moisture film, and later the drops, on the 
inner surface of the jar covering the leaves must come 

Fic. 131. After a few hours drops of water have accumulated on the 
inside of the jar covering the leaves. 
from the leaves. We see that it is not only on the 
sides of the jar, but also on the top above the leaves. 
So the water did not run off the leaves. 
