Voi,. 9 November 4, 1919 No. 18 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

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



BDRBAD OF PLANT INOUBTRV BDKBAD OF STANDARDS OBOPBYSICAL kABORATORV 



ASSOCIATE EDITORS 

 H, V. Harlan Sidney Paige 



BOTANICAL SOCISTT G80L00ICAL SOCIBTV 



N. Holuster S. a. Rohwer 



BIOLOGICAL SOCIBTV BNTOMOLOGICAL SOCIBTV 



E. C. McKelvy F. B, Sn.SBEE 



CHSmCAL SOCIBTV PHILOSOPHICAL SOCIBTV 



J. R Swanton 



ANTHROPOLOGICAL SOCIBTV 



PUBLISHED SBMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BY TH8 



WASHINGTON ACADEMY OF SCIENCES 



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Entered a« Second Clau Matter, January 25, 1919, at the post-office at Easton, Pa., undar th« 

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

 Section 1103, Act of October 3. 1917, Authorised on July 3, 1918 



