18 



TRANSPIRATION IN A DESERT PERENNIAL. 



EXPERIMENTS III TO V. 



The subject of these experiments was an adult tree designated C, about 

 20 feet high, growing southwest of the laboratory in an exposed place. 

 Three separate small branches were used, branch c being without leaves, 

 while d and e had a normal number of healthy leaves. The areas were : 

 c, 35.47 sq. cm.; d, 18.13 sq. cm.; e, 8.20 sq. cm. The platform was used 

 as before, but was mounted on a framework arranged to support the jar, etc. 

 The leaves on the tree were always completely closed before the readings 

 were begun. 



TABLE 3. Transpiration of a leafless branch (c) of an adult tree. Experiment III. 



