﻿Vol. 
  12 
  May 
  19, 
  1922 
  No. 
  10 
  

  

  JOURNAL 
  

  

  OF 
  THE 
  

  

  WASHINGTON 
  ACADEMY 
  

   OF 
  SCIENCES 
  

  

  BOARD 
  OF 
  EDITORS 
  

   S. 
  P. 
  BuiKB 
  SiDNsr 
  Paigb 
  E. 
  D. 
  WnxiAMSON 
  

  

  BOaSAO 
  09 
  PLANT 
  IKDOSTBT 
  OBOLOOICAI, 
  8UKWT 
  OaOPHTSICAI, 
  LABOKATOKT 
  

  

  ASSOCIATE 
  EDITORS 
  

  

  H. 
  V. 
  Hari^m 
  S. 
  a. 
  Rohwsb 
  

  

  aOYAmCAL 
  •OCIBTT 
  SNTOMOUOGICAl, 
  SOCIBTV 
  

  

  N. 
  HoiXISTBR 
  G. 
  W. 
  Stoss 
  

  

  ■lOLOOICAI, 
  SOCI8TT 
  GBOLOOICAl, 
  SOCIETY 
  

  

  W. 
  p. 
  MSQOSKS 
  J. 
  R. 
  SWAJfTOM 
  

  

  raiLOBOPBICAl, 
  aOCIBTV 
  ANTHROPOLOGICAI, 
  socibtv 
  

  

  PUBUSHBD 
  SBMI-MONTHLT 
  

   8XCBPT 
  IN 
  JULT, 
  AUOUST, 
  AND 
  SBPTBUBBK. 
  WHBN 
  MONTHLT 
  

  

  ■V 
  TBI 
  

  

  WASHINGTON 
  ACADEMY 
  OF 
  SCIENCES 
  

  

  OPVICB 
  OP 
  PtTBUCATION 
  

  

  21 
  1 
  CHURCH 
  STREET 
  

  

  BASTON, 
  PA. 
  

  

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

   Act 
  of 
  August 
  24, 
  1012. 
  Acceptance 
  for 
  mailing 
  at 
  special 
  rate 
  of 
  postage 
  provided 
  for 
  

   in 
  Seetion 
  1103, 
  Act 
  of 
  October 
  3, 
  1917. 
  Authorized 
  on 
  July 
  3, 
  1018. 
  

  

  