Semi-Monlhly 

 Twenty-Fourth Year 



537 SOUTH DEARBORN STPEFT 



CHICAGO, APRIL 25, 1919 



Library 



NEW YORK 

 BOTANICAL 



Subscription $2. 

 Vol. XLVII, No. 1 



PENROD-JURDEN COMPANY 



MEMPHIS, TENN. 



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 POSTOFFICE AT CHIOAOO. IIX^ UNDER ACT OF MARCH S. 1879 



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