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A Magazine of General Botany 



VOLUME 19 

 NUMBER 10 

 OCTOBER, 1916 



CONTAINING 



Improvements in the Method for Determining the Transpiring Power of 

 Plant Surfaces by Hygrometrlc Paper 



Burton E. Livingston and Edith B. Shreve 287 



A Summary of Bog Theories 



George B. Rigg 310 



Books and Current Literature 326 



Notes and Comment 329 



PUBLISHED MONTHLY 



OFFICE OF PUBLICATION 



2419-21 Greenmount Ave. 

 baltimore, md. 



EDITORIAL OFFICE 



TUCSON, ARIZONi 



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



