Vol. VIII No. 4 



Februaby 19, 2918 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 



OF SCIENCES 



BOARD OF EDITORS 

 Adolph Knopf A. S. Hitchcock J. Franklin Meyeb 



OEOLOQICAL BURVBT BUREAU OF^FLAMT INDUSTRX BUREAU 'OW BTAMDAKOS 



PUBLISHED SEMl-MONTHXy^ 

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WASHINGTON ACADEMY OF SCIENCES 



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Entered as Eecond-olass matter July H, 1911, at the^poet office at BaltimoTe.'Maryland, under the Act o' 



July 16. 1894 



