Vol. VIII No. 16 



October 4, 1918 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



Adolph Knopf 



asoLoaiOAL subtet 



BOARD OF EDITORS 

 A. S. Hitchcock 



BOBBAtr or PLANT INDCSTBT 



J. Franklin Metbb 

 bt;bsau of btandaros 



ASSOCIATE EDITORS 

 N. HOLLISTEB 



BIOLOOICAI. aOCIBIT 



J. B. Norton 



BOTANICAI. 80CIBTT 



Sidney Paige 



OaOLOGIOAL BOCIETT 



F. B. SiLSBEB 



PHIL080PHICAI, BOCfTBTT 

 R, B. SOSMAN 



CHEUICAL BOdXTY 



J. R. SWANTON 



ANTESOPOLOGICAL SOCIBTT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY. AUGUST AND SEPTEMBER, WHEN MONTHLY 



BT THB 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



Wn,LL^MS & WILKINS COMPANY 



BALTIMORE, MD. 



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



July 16, 1864. Acceptance for mailing at special rate of postage provided for in Section 1103, 



Act of October 3, 1017, Authorized on July 3, 1018 



