LLOYD 



PLATE 10. 



EXPLANATION OF PLATE. 

 Stomata of Verbena ciliata under red light. 



1. 6 a. m. Experiment 220, April 30. 3. 5 a. m. Experiment 220, May 3. 



2. 11 a. m. " " " _ " 4. 11 a . m. " " " " 



