Vol. VIII No. 11 



June 4, 1918 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Adolph Knopf A. S. Hitchcock J. Franklin Meyeb 



OEOLOQICAL SOBTBT BCBBATT Or PLANf INDTnTBT BTJBaAO OF STANDABSB 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BT THS 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 

 WILLIAMS * WILKINS COMPANY 

 BALTIMOBB, MD. 



Eatered as second -claas matter July li, 1911, at the post ofBce at Baltimore, Maryland, under tb« Aot of 



July 16. 18M 



