The 



Pi ant World 



A Magazine of General Botany 



VOLUME 16 

 N U M B E K 6 

 JUNE 1913 



OONTAININO 



rv. Osmotic Pressure and Related Forces as Environmental Factors 



By Burton Edward Livingston 16S 



Forest Distribution in the San Juan Islands : A Preliminary Note 



By George B. Rigg 177 



Books and Current Literature 183 



Notes and Comment 186 



PUBLISHED UONTEtLT 



OFFICE OF PUBLICATION 

 2419-21 YoBK Road 



BALTIMORE. MD. 



EDITORIAL OFFICE 



TUCSON, ARIZONA 



Eat«t«d M wcond-olMs matter March 9, ISII, at the pott office al Baltimore, Maryland, under tba Aot of July 18> 1894 



