Vol. VIII 



No. 18 



November 4, 1918 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



Adolph Knopf 



OBOLOOICAL SURVET 



BOARD OF EDITORS 

 A. S. Hitchcock ^ 



BUBKAU OF PLANT INDUSTRY 



ASSOCIATE EDITORS 

 N. HOLLISTER 



BIOLOGICAi SOdlfTT 



J. B. Norton 



BOTANICAL 80CTETT 



Sidney Paige 



GEOLOGICAL BOCIETT 



J. Franklin Mbtbb 



BUREAU OF 8IANDABD8 



F. B. Silsbeb 



PHILOSOPHICAL SOCrETT 



R. B. SOSMAN 



CHEMICAL SOCIETY 

 J. R. Sw ANTON 



ANTHSOPOLOGICAL SOCIOETT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BT TBB 



WA3HINGT0N ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



WILLIAMS & WILKINS COMPANY 



BALTIMORE. MD. 



Entered as second-claaa matter July 14, 1911 at the postoffice at Baltimore, Maryland, under tbe Act of 



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



Act of October 3, 1917, Authorized on July 3, 1918 



