Vol. VIII 



No. 19 



November 19, 1918 



JOUENAI 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



/ 



Adolph Knopf 

 acoLoaiCAL scbyet 



BOARD OF EDITORS 

 A. S. Hitchcock 



BVBSAU or PLANT INDUSTBt 



J. Franklin Meybh 



BCBEAU OF 6TANDABD9 



ASSOCIATE EDITORS 



N. HOLUSTER 



BIOLOQICAI. BOaXTt 



J. B. Norton 



BOTANICAI. SOaBTT 



Signet Paige 



OEOLOGICAI, SOCIETY 



F. B. Silsbee 



PHILOSOPHICAL eOClETT 



R. B. SOSMAN 



CHEMICAL 80CIETT 

 J. R. Sw ANTON 



AMTHBOPOLOGICAL 80C1BTT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN IdONTHLY 



BT THB 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



WILLIAMS & WILKINS COMPANY 



BALTIMORE, MD. 



Enteretl aa second-class matter July 14, 1911 at the postolTice at Baltimore, Maryland, under the Act of 



July 16, 18M. Acceptance for mailing at epecial rate of poetaee provided for in Section 1103, 



Act of October 3, 1917. Authorized on July 3, 1018 



