^ 



J>t 



^ 



V 



/ 



Vol. VIII 



No. 21 



December 19, 1918 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 



• OF SCIENCES 



Adolph Knopf 



OBOLOQICAL 8URTET 



BOARD OF EDITORS 

 A. S. Hitchcock 



BURCAO or PLANT INDU8TBT 



ASSOCIATE EDITORS 



N. HOLLISTER 



BIOLOGICAL 90CJBTT 



J. B. Norton 



BOTANICAL SOCIBTT 



Sidney Paiois 



OEOLOOICAL BOCIETT 



J. Franklin Meter 



BUBEAU or STANDARDS 



F. B. SlLSBEE 



PHILOSOPHICAL 80CIBTT 

 R. B. SOSMAN 



CHEMICAL SOOIBTT 

 J. R. Sw ANTON 



ANTHBOPOLOGICAL BOCIETT 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BT THB 



WASHINGTON ACADEMY OF SCIENCES 



OFFICE OF PUBLICATION 



WILLIAMS & WILKINS COMPANY 



BALTIMORE, MD. 



Entered as second-claAS matter July 14, 1911 at the poBtoffice at Baltimore, Maryland, under the Act of 



July IS, 1804. Acceptance for mailing at epecial rate of postage provided for in Section 1103, 



Act of October 8, 1917, Authorized on July 8, 1918 



