TRANSPIRATION AND LEAF-WATER 



TABLE IV 



Fouquieria splendens. Reading in tables I to III. inclusive, calculated to uniform 

 rate (100) 2-3 hour, August 21-22, 1910. Tucson, Arizona. 



It is probable that, for days of continuous sunshine this relation 

 continues till from one to four in the afternoon, during which 

 period the rates, while not equal, vary only very slightly in either 

 direction. On the day during which the observations were made 

 the sky was obscured by a haze, which began to appear at about 

 8 a.m., and lasted until after ten. The effect of this diminution 

 of light was recorded by three atmometers in a fashion similar, 

 broadly speaking, to that of the pieces. The rates of evaporation 

 displayed by one of the atmometers, a blackened porous cup, 5 



5 Livingston, B. E. A Radio-atmometer for Comparing Light Intensities. 

 Plant World, 14:96-99. Apr., 1911. 



