8 



FRANCIS E. LLOYD 



placed perpendicularly to the plane of the sun's apparent path, 

 are given in table V, and the graph for these is plotted in the figure. 

 The reduced evaporation, largely due to reduced light, recorded 

 by the radio-atmometer, is paralleled by the transpiration curve 

 as determined by weight, and the conditions were evidently such 



1 r 



*9 20 2i >2 



Fig. 1 



as to enable the leaves to exert a damping effect on transpiration 

 and, as a result, to retain some of the water received by them. 

 This is true for the 9-10 hour for all three pieces. For the 12-13 

 hour, the increase in evaporation was accompanied by retention 

 of water in piece 1 (fig. 1) and in piece 3, but by a slight loss in 



