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Vol. II June 4, 1921 No. 11 



JOURNAL 



OF THB 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 Robert B. Sosman S. F. Bi^kb Sidney Paiob 



OBOPBVSICAI. LABOEATORT BIJK8AD OF PLANT INDCSTKT OBOLOOICAI. SORVBY 



ASSOCIATE EDITORS 



H. V. Harlan F. B. Siwbbb 



BOTANICAL SOCIBTT PHILOSOPEQCAL 80CIBTT 



N. HoivWSTBR G. W. STOSB 



BIOLOGICAL SOCIBTV QBOLOOICAL SOCaBTT 



S. A. ROHWBR J- R. SWANTON 



BNTOMOLOOICAL SOCIBTV ^ ANTHROPOLOOICAL SOCIETy 



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 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



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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. 



