358 



Eelation" of Watke to the Bbhatiob or 



Hourly -8 10 12 2 



Units A.M. 



P.M. 



8 10 12 2 4 

 P.M. AM. 



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

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



Fio. 1. — Curves showing relation between dally 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. 



