Voi,. 9 May 19, 1919 No. 10 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 



A. S. Hitchcock J. Franexin Meyer R. B. Sosman 



BUREAU OF PI;ANT industry BURBAU op standards GSOPBVSICAl, LABORATORY 



ASSOCIATE EDITORS 



H. V. HarIvAn Sidney Paige 



BOTANICAL SOCIETY GEOLOGICAL SOCIBTV 



N. HotUSTER S. A. ROHWER 



BIOLOGICAL 80CIBTY ENTOMOLOGICAL SOCIETY 



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



CHEMICAL SOCIETY PHILOSOPHICAL SOCIETY 



J. R. SWANTON ^^'SZA 



ANTHROPOLOGICAL SOCIETY 



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Entered as Second Class Matter, January 25, 1919, at the post-ofSce at Easton, Pa., under the 

 Act of August 24, 1912. Acceptance for mailing at special rate of postage provided for in 

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