﻿JOURNAL 
  

  

  OF 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  

  

  OF 
  SCIENCES 
  

  

  VOLUME 
  12, 
  1922 
  

  

  

  ■^••^ 
  

  

  .LxJ 
  L 
  I 
  3 
  R 
  A 
  R 
  

  

  S. 
  F. 
  Blake 
  

  

  BUREAU 
  OF 
  PLANT 
  INDUSTRY 
  

  

  BOARD 
  OF 
  EDITORS 
  

   Sidney 
  Paige 
  

  

  GEOLOGICAL 
  SURVEY 
  

  

  E. 
  D. 
  WlIvUAMSON 
  

   GEOPHYSICAL 
  LABORATORY 
  

  

  ASSOCIATE 
  EDITORS 
  

  

  H. 
  V. 
  Harlan 
  

  

  BOTANICAL 
  SOCIETY 
  

  

  N. 
  HOLLISTER 
  

  

  BIOLOGICAL 
  SOCIETY 
  

  

  W. 
  F. 
  Meggers 
  

  

  PHILOSOPHICAL 
  SOCIETY 
  

  

  S. 
  A. 
  ROHWER 
  

  

  ENTOMOLOGICAL 
  SOCIETY 
  

  

  G. 
  W. 
  Stose 
  

  

  GEOLOGICAL 
  SOCIETY 
  

  

  J. 
  R. 
  Swanton 
  

  

  ANTHROPOLOGICAL 
  80CI8TY 
  

  

  PUBLISHED 
  semi-monthly 
  

   EXCEPT 
  IN 
  JULY, 
  AUGUST, 
  AND 
  SEPTEMBER, 
  WHEN 
  MONTHLY 
  

  

  BY 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  

  

  OFFICE 
  OF 
  PUBLICATION 
  

  

  211 
  CHURCH 
  STREET 
  

  

  EASTON, 
  PA. 
  

  

  