Vol,. 9 



September 19, 191 9 



No. 15 



JOURNAL 



OK THE 



WASHINGTON ACADEMY 

 OF SCIENCES 



A. S. Hitchcock 



BCKSAU OF PLANT INDOSTRV 



BOARD OF EDITORS 

 J. FrankIvIn Meyer 



BUREAU OP STANDARDS 



R. B. SOSHAN 



CBOFBVSICAL LABORATOBT 



ASSOCIATE EDITORS 



H. V. Harlan 



BOTANICAL, SOCISTY 



N. HOLLISTER 



BIOLOGICAL SOCISTY 



E. C. McKelvy 



CaSlUCAL SOCISTY 



Sidney Paige 



GBOLOOICAL SOCISTY 



S. A. ROHWER 



BNTOMOLOGICAL SOCISTY 



F. B. SasBEE 



PHILOSOPHICAL SOCISTY 



J. R. Swanton 



ANTHROPOLOGICAL SOCISTY 



PUBLISHED SEMI-MONTHLY 

 EXCEPT IN JULY, AUGUST, AND SEPTEMBER. WHEN MONTHLY 



BY THB 



WASHINGTON ACADEMY OF SCIENCES 



OlfPICE OF PUBLICATION 



211 CHURCH STREET 



EASTON, PA. 



Entered u Second ClaM Matter, January 25, 1919, at the post-office at Eaiton, Pa., under tht 

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

 Section 1 103, Act of October 3. 1917. Authorized on July 3, 1918 



