PLATE 9 



Explanation op Plate. 

 Stomata of Verbena ciliata at various times, under red light. 



1. 4»30'» a. m. Experiment 212. 3. 11 a. m. Experiment 214, control. 



2. ll>>30 m a. m. " " 4. 6>>30- p. m. " 214. 

 2o. A single plastid from figure 2. 5. ll^O 1 " a. m. " 218. 



