LOSS OF WATER 2$ 



of the jar will soon become clouded by a thin film of 

 moisture, and within a very short time, this moisture will 

 .begin to collect in drops (Fig. 13). 



i i i 4 if 



4 4S 



1 





Fig. 15. — Asler sp. Series of leaves, all from one plant, showing gradual 

 transition from petiolate (lower right hand specimen) to sessile leaf. 



The surface of the control jar will remain perfectly dry. 

 If the experiment is set in the sun, the result will be 

 greatly hastened. This loss of water from within living 



