326 



L. A. GIDDINGS 



Fig. 9. Curves of transpiration of vaselined leaves of Silphium (solid lines, 

 numbered as in table 9) and of wind velocity (broken lines) in experiment of 

 September 1, 1912. 



97' 

 930 



89° 

 85° 



81' 



73« 



69' 

 65* 



6:45 



8:45 



10:45 



12:45 



2:45 



4:45 



6:45 



Fig. 10. Curves of evaporation at two heights (solid lines, numbered as in 

 table 9) and of temperature and relative humiditv for experiment of September 

 1, 1912. 



