PAPERS BY MEMBERS 



Fig-. 1. Graphs showing the range of the evaporating 

 power of the air in a flood plain forest at Streator, III. Fig- 

 ures at the right indicate the height of the station above the 

 surface of the soil. 



Fig-. 2. Graphs showing the range ot the evaporating 

 power of the air in the oak forest at Palos Park. 111. 



ground, 0, the others at heights of 2. 6, and 13 meters. The 

 last was at the general upper surface of the foliage 

 while the others were carefully placed so as to be 

 subject to very nearly average conditions of foliage 

 density for their respective heights above the surface. The 

 records extend from May 18 to June 12. 1912. The readings 

 are expressed as in the former study. It will be seen by com- 

 parison that in general the rates of evaporation are much 

 higher than in the Streator forest, reaching 16 cc. per day for 

 the sur^ce station at the end of the period and about 24 cc. 

 per day for the upper surface of the forest foliage at the same 



