Voi,. lo ApriIv 19, 1920 No. 8 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 J. PKANKI.IN Mbybk RobbsT B. Sosman Albxandbr Wbtmoks 



BVnBAV OP BTANDABDS OBOPBT8ICAI, LABOBATOMV BIOLOGICAL 8UBVBY 



ASSOCIATE EDITORS 



H. V. Haklan S. a. Rohwbr 



BOTANICAL SOCIBTT BNTOMOLOGICAL BOCISTT 



N. HOLUSTBR P. B. SiLSBBB 



BIOLOOICAL SOCIHTT PHILOSOPHICAL 80CIBTT 



SlDNBY PaIGB J. R. SWANTON 



OBOLOOICAL aOCIBTT ANTBKOPOLOOICAL aOCIBTV 



PUBLISHBD S8MI-HONTHLY 

 BXCBPT IN JUIY, AUGUST, AND SBPTBMBBR, WHBN MONTHLY 



BY TB8 



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211 CHURCH STRERT 



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Entered m Second Claaa Matter, January 23, 1919. at the poat-officc at Baatoa. Pa., under the 

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