Vol. VIII No. 10 



May 19, 1918 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Adolph Knopf A. S. Hitchcock J. Franklin Mbtbb 



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WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 

 WILLIAMS 3c WILKINS COMPANY 

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Entarad as seoond-claas matter July 14, 1911, at tha post o'Bco at Baltimoro, Maryland, under thi Aot o^ 



July 10, ISM 



