LLOYD 



PLATE 12 



EXPLANATION OF PLATE. 

 Stomata of Verbena ciliata in darkness. 



1. 11*30 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, 11 a, m., January 11. Starch is absent from the mature s to mat a, a, b, and 



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



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



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

 and 7. Young stomata containing an abundance of starch. 



