﻿Journal 
  of 
  the 
  Washington 
  Academy 
  of 
  Sciences 
  

  

  This 
  Journal, 
  the 
  official 
  orgsin 
  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 
  mem- 
  

   bers 
  of 
  the 
  Academy; 
  (2) 
  short 
  abstracts 
  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 
  will 
  be 
  sent 
  to 
  

   authors 
  unless 
  requested. 
  It 
  is 
  urged 
  that 
  manuscript 
  be 
  submitted 
  in 
  final 
  form; 
  

   the 
  editors 
  will 
  exercise 
  due 
  care 
  in 
  seeing 
  that 
  copy 
  is 
  followed. 
  

  

  Authors' 
  Copies 
  and 
  Reprints. 
  — 
  On 
  request 
  the 
  author 
  of 
  an 
  original 
  article 
  will 
  

   receive 
  gratis 
  ten 
  copies 
  of 
  the 
  number 
  containing 
  his 
  contribution 
  and 
  as 
  many 
  

   additional 
  copies 
  as 
  he 
  may 
  desire 
  at 
  ten 
  cents 
  each. 
  Reprints 
  will 
  be 
  furnished 
  at 
  

   the 
  following 
  schedule 
  of 
  prices: 
  

  

  Covers 
  bearing 
  the 
  name 
  of 
  the 
  author 
  and 
  title 
  of 
  the 
  article, 
  with 
  inclusive 
  

   pagination 
  and 
  date 
  of 
  issue, 
  will 
  be 
  furnished 
  when 
  ordered. 
  

  

  As 
  an 
  author 
  will 
  not 
  ordinarily 
  see 
  proof, 
  his 
  request 
  for 
  extra 
  copies 
  or 
  re- 
  

   prints 
  should 
  invariably 
  be 
  attached 
  to 
  the 
  first 
  page 
  of 
  his 
  manuscript. 
  

  

  The 
  rate 
  of 
  Subscription 
  per 
  volume 
  is 
  $6.00* 
  - 
  

  

  Semi-monthly 
  numbers 
  25 
  

  

  Monthly 
  numbers 
  50 
  

  

  i?em«tfa«c«5 
  should 
  be 
  made 
  payable 
  to 
  "Washington 
  Academy 
  of 
  Sciences," 
  

   and 
  addressed 
  to 
  the 
  Treasurer, 
  R. 
  L. 
  Paris, 
  Coast 
  and 
  Geodetic 
  Survey, 
  Wash- 
  

   ington, 
  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 
  

   nithin 
  thirty 
  days 
  after 
  date 
  of 
  the 
  following 
  issue. 
  

  

  *Velninc 
  I, 
  tiowever, 
  from 
  July 
  19, 
  1911, 
  to 
  December 
  19, 
  1911 
  wUl 
  be 
  tent 
  for 
  13.00. 
  Special 
  

   rates 
  arc 
  giTeo 
  to 
  membera 
  of 
  scientific 
  societies 
  affiliated 
  with 
  the 
  Academy 
  

  

  