Vol. io March 19, 1920 No. 6 



JOURNAL 



OP THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS 

 J. pRANKi^m Mbyek Robert B. Sosbian Ai«bxandbr Wstmorb 



BCRSAD OF STANDABDS OBOPHTSICAL LABOBATOKV BIOLOGICAL SDKVST 



ASSOCIATE EDITORS 



H. V. HAKUiN S. A. ROBWSR 



BOTAMICAt 90CUTV BNTOUOLOOICAI. •OCISTT 



N. HOLUSTER F. B. SiLSBSB 



BIOLOGICAL 80CI8TT PHILOSOPHICAL SOCIBTT 



Sidney Paige J. R. Swanton 



OBOLOOICAL SOCIBTT ANTHROPOLOGICAL BOCIBTV 



PUBLISHBD SBMI-MONTHLY 

 BXCEPT m JULY, AUGUST, AND SEPTBMBBR, WHEN MONTHLY 



BT THB 



WASHINGTON ACADEMY OF SCIENCES 



oroiCB OP PUBLICATION 



311 CH17RCH STRBBT 



BASTON, PA. 



Botwed m» Second Class Matter, January 25. 1919, at the post-office at Easten, Ps.. uadsv th« 

 Act of August 24, 1912. Acceptance for mailing at special rate of postage proTidcd for In 

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