﻿Vol. 
  12 
  

  

  September 
  19, 
  1922 
  

  

  No. 
  15 
  

  

  JOURNAL 
  

  

  OF 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  

   OF 
  SCIENCES 
  

  

  S. 
  F. 
  Blake 
  

  

  nURRAtt 
  0» 
  Pl^ANT 
  INDOSTRV 
  

  

  BOARD 
  OF 
  EDITORS 
  

   Sidney 
  Paige 
  

  

  GEOLOGICAI, 
  SURVEV 
  

  

  E. 
  D. 
  WlLUAMSOX 
  

   GBOPHYSICAJU 
  I,ABORATORV 
  

  

  ASSOCIATE 
  EDITORS 
  

  

  H. 
  V. 
  Harlan 
  

  

  BOTANICAL 
  SOCIETY 
  

  

  N. 
  HoLLISTER 
  

  

  BIOLOGICAI, 
  SOCIETV 
  

  

  W. 
  F. 
  Meggers 
  

  

  PHILOSOPHICAI, 
  SOCIETY 
  

  

  S. 
  A. 
  ROHWER 
  

  

  ENTOMOLOGICAI, 
  SOCIETY 
  

  

  G. 
  W. 
  Stose 
  

  

  GEOLOGICAL 
  SOCIETY 
  

   J. 
  R. 
  S 
  WANTON 
  

  

  ANTHROPOLOGICAL 
  SOCIETV 
  

  

  PUBLISHED 
  SEMI-MONTHLY 
  

   EXCEPT 
  m 
  JULY, 
  AUGUST, 
  AND 
  SEPTEMBER, 
  WHEN 
  MONTHLY 
  

  

  BY 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  

  

  OFFICE, 
  OF 
  PUBLICATION 
  

  

  211 
  CHURCH 
  STREET 
  

  

  EASTON, 
  Pa. 
  

  

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

  

  Act 
  of 
  August 
  24, 
  1912. 
  Acceptance 
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  at 
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  rate 
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  provided 
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  in 
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  1103, 
  Act 
  of 
  October 
  3, 
  1917. 
  Authorized 
  ou 
  July 
  3, 
  1918. 
  

  

  