358 



Relation of Water to the Behavioe of 



Hourly - 

 Units 



8 10 12 2 4 6 8 10 12 2 4 ^ 8 10 12 2 4 6 8 10 12 2 4 

 A.M. P.M. P.M. AM. AM. P.M. P.M. AM. 



Fig. 1.— Curves showing relation between daily progress of evaporation and 

 transpiration rates of beetles when exposed to different strata produced by an 

 association of potato plants. Consult table 5 for above data. 



Fig. 2. — Results recorded in table 5 reduced to unity and curves plotted in 

 order to draw a closer comparison than is given in figure 1. The same conclusions 

 are self-evident. 



