Vol. VIII No. 13 



July 19, 1918 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Adolph Knopf A. S. Hitchcock J. Fbanklin Mbyeb 



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PUBLISHED 8EMI.M0NTHLY 

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WASHINGTON ACADEMY OF SCIENCES 



OmCB 07 PTTBUCATION 

 WILLIAMS A WILKIN8 COMPANY 

 BALTIMOBB, MO. 



Eatared m seoond-class matter July U, 1911, at the port offioa at Baltimore, Maryland, undar the Act of 



July 10. 1804 



