Voi,. lo ApRiiy 4, 1920 No. 7 



JOURNAL 



OF THUS 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 J. pRANKi^m Meyek Robert B. Sosman Albzandbr Wstmorb 



BCBBAD OP STANDARI^ OBOPHTSICAL LABOKATOKT BIOU>GICAL SUKVBT 



ASSOCIATE EDITORS j 



H. V. Hariwin S. a. RohwBr '] 



BOTANICAL SOCISTT BNTOMOLOOICAL SOCOITT \ 



i 



N. HOLUSTER F. B. SiLSBEB j 



BIOLOOICAI. SOCI8TV PHILOSOPHICAL SOCISTT ] 



Sidney Paige J. R. Swanton ; 



OSOLOOICAL SOCISTV ANTHBOPOLOOICAI, BOCISTV ' 



PUBLISHED SBMI-MONTHLY 

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Entered aa Second CUm Matter, January 23, 1919, at the poat-office at Eaatoa, Pa., under the 

 Act of Aug:uat 24, 1912. Acceptance for mailing at fpecial rate of pottage proTlded for in 

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



