LOSS OF WATER 



25 



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). 



Fig. 15. — Aslcr Sp. Series of leaves, all from one plant, showing 

 gradual transition from petiolate (lower right hand specimen) to sessile 

 leaf. (Photo, by the author.) 



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 



