ciuZi 



A Journal of General Botany 



VOLUME 20 

 NUMBER 10 

 OCTOBER, 1917 





CONTAINING 



The Interpretation and Application of Certain Terms and Concepts in the 

 Ecological Classification of Plant Communities 

 George E, Nichols 305 



Relation of the Rate of Root Growth in Seedlings of Prosopis Velutina 

 to the Temperature of the Soil 

 W. A. Cannon 320 



Books and Current Literature 334 



Notes and Comment 339 



PUBLISHED MOIWHLT 



OFFICE OF PUBLICATION 



2419-21 Greenmount Ave. 



baltimore, md. 



EDITORIAL OFFICE 



TUCSON, ARIZONA 



Entered as second-class matter March 9, 1912, at the post office at Baltimore, Maryland, under the act of July 16, 1894 



