Vol.. 9 December 19, 19 19 No. 21 



JOURNAL 



OF THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



BOARD OF EDITORS • 

 A. S. Hitchcock J. Franklin Meyer R. B. Sosman 



BUKSAD OP PLANT INDDSTRV BDRBAD OP STANDARDS GEOPHYSICAL LABORATORT 



ASSOCIATE EDITORS 



H. V. Harlan S. A. Robwbr 



BOTANICAL SOCISTY BNTOUOLOGICAL SOCISTV 



N. HOLLISTER F. B. SiLSBEE 



BIOLOGICAL SOCISTY PHILOSOPHICAL SOCISTY 



Sidney Paige J. R. Swanton 



GSOLOGICAL SpCISTY ANTHROPOLOGICAL SOCISTY 



PUBLISHED SSMI-MONTHLY 

 EXCEPT m JXn.Y, AUGUST, AND SEPTEMBER, WHEN MONTHLY 



BY THS 



WASHINGTON ACADEMY OF SCIENCES 



office op publication 



211 chxxrch street 



easton, pa. 



Entered as Second Class Matter, January 25, 1919. at the post>office at Eatton. Pa., under the 

 Act of August 24, 1912. Acceptance for mailing at special rate of postage provided for ia 

 Section 1103, Act of October 3. 1917, Authorized on July 3. 1918 



