﻿Journal 
  of 
  the 
  Washington 
  Academy 
  of 
  Sciences 
  

  

  This 
  JotTRNAL, 
  the 
  offidal 
  organ 
  of 
  the 
  Washington 
  Academy 
  of 
  Sciences, 
  aims 
  to 
  

   present 
  a 
  brief 
  record 
  of 
  current 
  scientific 
  work 
  in 
  Washington. 
  To 
  this 
  end 
  it 
  publishes: 
  

   (1) 
  short 
  original 
  papers, 
  written 
  or 
  communicated 
  by 
  members 
  of 
  the 
  Academy; 
  (2) 
  

   short 
  notes 
  of 
  current 
  scientific 
  literature 
  published 
  in 
  or 
  emanating 
  from 
  Washington; 
  

   (3) 
  proceedings 
  and 
  programs 
  of 
  meetings 
  of 
  the 
  Academy 
  and 
  affiliated 
  Societies; 
  (4) 
  

   notes 
  of 
  events 
  connected 
  with 
  the 
  scientific 
  life 
  of 
  Washington. 
  The 
  Journal 
  is 
  issued 
  

   semi-monthly, 
  on 
  the 
  fourth 
  and 
  nineteenth 
  of 
  each 
  month, 
  except 
  during 
  the 
  summer 
  

   when 
  it 
  appears 
  on 
  the 
  nineteenth 
  only. 
  Volumes 
  correspond 
  to 
  calendar 
  years. 
  Prompt 
  

   publication 
  is 
  an 
  essential 
  feature; 
  a 
  manuscript 
  reaching 
  the 
  editors 
  on 
  the 
  eighth 
  or 
  

   the 
  twenty-fourth 
  of 
  the 
  month 
  will 
  ordinarily 
  appear, 
  on 
  request 
  from 
  the 
  author, 
  in 
  the 
  

   issue 
  of 
  the 
  Journal 
  for 
  the 
  following 
  fourth 
  or 
  nineteenth, 
  respectively. 
  

  

  Manuscripts 
  may 
  be 
  sent 
  to 
  any 
  member 
  of 
  the 
  Board 
  of 
  Editors; 
  they 
  should 
  be 
  

   clearly 
  typewritten 
  and 
  in 
  suitable 
  form 
  for 
  printing 
  without 
  essential 
  changes. 
  The 
  

   editors 
  cannot 
  undertake 
  to 
  do 
  more 
  than 
  correct 
  obvious 
  minor 
  errors. 
  References 
  

   should 
  appear 
  only 
  as 
  footnotes 
  and 
  should 
  include 
  year 
  of 
  publication. 
  

  

  Illustrations 
  will 
  be 
  used 
  only 
  when 
  necessary 
  and 
  will 
  be 
  confined 
  to 
  text 
  figures 
  

   or 
  diagrams 
  of 
  simple 
  character. 
  The 
  cost 
  of 
  producing 
  cuts 
  for 
  illustrations 
  must 
  be 
  

   met 
  by 
  the 
  author. 
  

  

  Proof. 
  — 
  In 
  order 
  to 
  facilitate 
  prompt 
  publication 
  no 
  proof 
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  be 
  sent 
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  authors 
  

   unless 
  requested. 
  It 
  is 
  urged 
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  manuscript 
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  submitted 
  in 
  final 
  form; 
  the 
  editors 
  

   will 
  exercise 
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  care 
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  copy 
  is 
  followed. 
  

  

  Authors' 
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  Reprints. 
  — 
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   ceive 
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  of 
  the 
  number 
  containing 
  his 
  contribution 
  and 
  as 
  many 
  additional 
  

   copies 
  as 
  he 
  may 
  desire 
  at 
  ten 
  cents 
  each. 
  Reprints 
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  be 
  furnished 
  at 
  the 
  following 
  

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  Copies 
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  6.66 
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  150 
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  200 
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  250 
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  . 
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  Covers 
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  and 
  date 
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  As 
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  his 
  request 
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   should 
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  manuscript. 
  

  

  The 
  rate 
  of 
  Subscription 
  per 
  volume 
  is 
  $6.00* 
  

  

  Semi-monthly 
  numbers 
  .25 
  

  

  Monthly 
  numbers 
  .50 
  

  

  Remittances 
  should 
  be 
  made 
  payable 
  to 
  "Washington 
  Academy 
  of 
  Sciences," 
  and 
  

   addressed 
  to 
  the 
  Treasm-er, 
  R. 
  L. 
  Fans, 
  Coast 
  and 
  Geodetic 
  Survey, 
  Washington, 
  D. 
  C. 
  

  

  European 
  Agent: 
  William 
  Wesley 
  & 
  Son, 
  28 
  Essex 
  St., 
  Strand, 
  London. 
  

  

  Exchanges. 
  — 
  The 
  Journal 
  does 
  not 
  exchange 
  with 
  other 
  publications. 
  

  

  Missing 
  Numbers 
  will 
  be 
  replaced 
  without 
  charge, 
  provided 
  that 
  claim 
  is 
  made 
  within 
  

   thirty 
  days 
  after 
  date 
  of 
  the 
  following 
  issue. 
  

  

  •Volume 
  I, 
  however, 
  from 
  June 
  19. 
  1911. 
  to 
  December 
  19, 
  1911. 
  will 
  be 
  sent 
  for 
  $3.00. 
  Specie! 
  rates 
  

   are 
  ^veo 
  to 
  members 
  of 
  scientific 
  societies 
  affiliated 
  with 
  the 
  .\cademv 
  

  

  