Vol. VIII No. 7 



April 4, 1918 



JOUENAL 



OF THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Adolph Knopf A. S. Hitchcock J. FRANKLm Meteb 



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Entered as second-class matter July 14, 1911, at the post office at Baltimore, Maryland, under the Act of 



July 16, 1894 



