2 ' 



Explanation op Plate. 

 Stomata of Verbena ciliata at various times, under blue light 



J' ,S! am " Expe r ent213 ' 4.11b30-a.m. (0/. figure 3.) Experiment 215. 



I. 11 30" a. m. 5 6h3()m p m „ „ „ 



2a. A plastid from figure 2. 6 . n h 30m a . m . Ex p erimen t 2 17 



3. IPSO 1 " a. m. Experiment 213, control. 



