Vol. II 



September 19, 1921 



No. 15 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



Robert B. Sosman 



OBOPUYSICAL LABORATOKT 



BOARD OF EDITORS 

 S. F. Blake 



BDKBAU OP PLANT INDUSTBV 



SiDNBY PAIGB 

 OBOLOOICAL BDKVBV 



ASvSOCIATE EDITORS 



H. V. Harlan 



BOTANICAL SOCIBT? 



N. HOLUSTER 



BIOLOGICAL SOCIBTV 



S. A. ROHWER 



BNTOMOLOGICAL 30CIST* 



F. B. SiLSBBB 



PBILOSOPaiCAL SOCIKTY 



G. W. Stose 



OBOLOOICAL SOCIBTY 



J. R. Swanton 



ANTHROPOLOGICAL SOCIBTV 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BV TBB 



WASHINGTON ACADEMY OF SCIENCES 



OPFICB OF PUBLICATION 



211 CHURCH STREET 



EASTON, PA. 



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. 



