Voi,. 9 June 19, 1919 No, 12 



JOURNAL 



. OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 



A, S. Hitchcock J. Franklxn Meyer R. B. Sosman 



BDK8AD OF PLANT INDOSTXV BURHAD OF STANDARDS CBOPBySICAI. LABORATOKT 



ASSOCIATE EDITORS 



H. V. Harlan Sidney Paige 



BOTANICAL SOCISTV GBOLOOICAL SOCIBTY 



^ N. HOLUSTER S. A. ROHWER 



BIOLOGICAL SOCISTy BNTOHOLOGICAL SOCIBTT ~ 



E. C. McKei^vy F. B. Silsbee 



CHBMICAL SOCISTY PHILOSOPHtCAL SOCISTT 



J. R. SWANTON 



ANTHROPOLOGICAL SOCISTV 



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Entered a* Second Clasa Matter, January 25. 1919, at the post-office at Eaaton. Pa., under the 

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