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The 



Pi ant World 



A Magazine of General Botany 



VOLUME 20 

 NUMBER 2 

 FEBRUARY, 1917 



CONTAINING 



Observations on a New Type of Artificial Osmotic Cell 



Joshua Rosett 37 



Some Undescribed Prairies in Northeastern Arkansas 



Roland M. Harper 58 



Books and Current Literature 62 



Notes and Comment 65 



PtTBLISHBD MONTHLT 



OFFICE OF PUBLICATION 



2419-21 Greenmount Ave. 



BALTIMORE, MD. 



EDITORIAL OFFICE 



TUCSON, ARIZONA 



'yV 



Entered bb Becond-cla«« matter March 9, 1912, at the post office at Baltimore, Maryland, under the Act of July 16, 18S4 



