f y^ 





A Magazine of General Botany ,""J ! 



VOLUME 18 

 NUMBER 12 



DECEMBER, 1915 



CONTAINING 



Effect of Vanillin as a Soil Constituent. 



J. J. Skinner 321 



An Investigation of the Causes of Autonomic Movements in Succulent 

 Plants. II. 

 Edith Bellamy Shreve 331 



Books and Current Literature 344 



Notes and Comment 346" 



PUBLISHED MONTHLY 



OFFICE OF PUBLICATION 



2419-21 Greenmount Avb. 



BALTIMORE, MD. 



EDITORIAL OFFICE 



TUCSON, ARIZONA 





V 



Entered as second-class matter March 9, 1912, at the post office at Baltimore, Maryland, under the Act of July 16, 1804 



