Vol. VIII No. 15 



September 19, 1918 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



Adolph Knopf 



OXOLOaiCAL aUBTXT 



BOARD OF EDITORS 



A, S. Hitchcock 



BVBaAU OF PLANT INDUBTBT 



J. Franklin Metbb 



BtTBKAU OF BTANSABDS 



ASSOCIATE EDITORS 

 N. HOLUSTER 



BIOLOGICAL 80CIBTT • 



J. B. Norton 



BOTANICAL BOCIETT 



Sidney Paige 



GBOLOGICAL BOCIETT 



F. B. Silsbee 



PHILO8OPBI0AL SOOISTT 

 R. B. SOSMAN 



CHEMICAL BOCIETT 

 J. R. Sw ANTON 



A NTHBOPOLOQICAL BOCIETT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST AND SEPTEMBER. WHEN MONTHLY 



BT IBB 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



WILLIAMS & WILKINS COMPANY 



BALTIMORE, MD. 



Entered as seoond-olass matter July 14, 1911 at the itoatoffice at Baltimore, Maryland, under the Act of 

 July IS, 1S64. Aooeptance for mailing at special rate of postai^e provided for in Section 1103, 

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



