Voi,. lo Jun:^ 19, 1920 No. 12 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 



J. PRAMIXIK MSYSK ROBBIT B. SOSMAN AlEXANDBK WBTMOKS 



BDUAD OV ITAMDABDa OBOrBTMCAL LABOSATOKT BIOLOGICAL BCRTBT 



ASSOCIATE EDITORS 



H. V. Haklan S. a. Rohwbr 



BOTAMICAL SOCnTT BHTGIIOLOOICAL BOCnTT 



N. H0U.ISTBR P. B. Sn^BBB 



BIOLOGICAL BOCISTT PBILOSOPHICAL BOCIBTT 



Sidney Paigb J. R. Swanton 



OBOLOOICAL aOCIBTT AMTHKOrOLOOICAL 80CIBTT 



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