A Magazine of General Botany 



VOLUME 18 

 NUMBER 9 



SEPTEMBER, 1915 



CONTAINING 



A Study of the Root- Systems of Prairie Plants of Southeastern Washing- 

 ton. I. 



John Ernst Weaver 227 



A Relative Score Method of Recording Comparisons of Plant Condition 

 and other Unmeasured Characters. 



E. E. Free 249 



Books and Current Literature 257 



Notes and Comment 259 



PUBLISHED MONTHLY 



OFFICE OF PUBLICATION 



2419-21 Grebnmount 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 



