Vol. II May 19, 1921 No. 10 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



'^ BOARD OF EDIT'ORS 



Robert B. Sosman S. F. Blake Sidney Paiob 



OROPBYSICAI. lABORATORT BORBAD OF PLAMT INDUSTKT OSOI.OOICAL SDRVST 



ASSOCIATE EDITORS 



H V Harlan F. B. Silsbbs 



BOTANICAl, SOCISTT PHILOSOPHICAL SOCISTT 



N. HOLLISTER G. W. Stoss 



BIOtOOICAL SOCIBTY OBOLOOICAI, SOCtST* 



S. A. RohWER J. R. SWANTON 



BNTOMOLOOICAl, SOCIBTY ANTBROPOLOOICAI. SOCISTT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BY THB 



WASHINGTON ACADEMY OF SCIENCES 



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



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



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



