NORMAL STOMATAI, MOVEMENT. 



107 



3a.m. 



FIG. 36. Stomata, upper surface, secondary leaves of Fouquieria splendens, July 

 27-28, 1906. (Curve c, fig. 37.) 



3a.m. 6 9 12m. 3p.m. 6 9 



FIG. 37. Curves of means in figs. 34, 35, and 36, with grand mean of same (tf). 



TABLE 520. Sizes of stomatal openings under normal conditions. Tumamoc Hill, December 

 17-18, 1906. (Fig. 38.) Fouquieria splendens. Measurements in micro,. 



