PLATE 12 



Explanation of Plate. 

 Stomata of Verbena ciliata in darkness. 



1. ll^O^a. m., March 30. Experiment 210. 



2. Two plastids showing extremes of starch content at 6 a. m. Experiment 210 



3. A group , of stomata u a. m., January 11 Starch is absent from the mature stomata, a, b, and 



d, but is present in abundance in the young ones, c and e (figures 6 and 7). 



4. A mature stoma containing no starch, 11 a. in., January 11. 



5. Stoma at 11 a. m., January 12, after 24 hours of darkness. Of. figure 4, which is the control 

 6 and 7. Young stomata containing an abundance of starch. 



