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  The 
  scientific 
  publications 
  of 
  the 
  National 
  Museum 
  include 
  two 
  

   series, 
  known, 
  respectively, 
  as 
  Proceedings 
  and 
  Bulletin. 
  

  

  The 
  Proceedings, 
  begun 
  in 
  1878, 
  is 
  intended 
  primarily 
  as 
  a 
  medium 
  

   for 
  the 
  publication 
  of 
  original 
  papers, 
  based 
  on 
  the 
  collections 
  of 
  the 
  

   National 
  Museum, 
  that 
  set 
  forth 
  newly 
  acquired 
  facts 
  in 
  biology, 
  

   anthropology, 
  and 
  geology, 
  with 
  descriptions 
  of 
  new 
  forms 
  and 
  

   revisions 
  of 
  limited 
  groups. 
  Copies 
  of 
  each 
  paper, 
  in 
  pamphlet 
  form, 
  

   are 
  distributed 
  as 
  published 
  to 
  libraries 
  and 
  scientific 
  organizations 
  

   and 
  to 
  specialists 
  and 
  others 
  interested 
  in 
  the 
  different 
  subjects. 
  

   The 
  dates 
  at 
  which 
  these 
  separate 
  papers 
  are 
  published 
  are 
  recorded 
  

   in 
  the 
  table 
  of 
  contents 
  of 
  each 
  of 
  the 
  volumes. 
  

  

  The 
  present 
  volume 
  is 
  the 
  sixty-seventh 
  of 
  this 
  series. 
  

  

  The 
  Bulletin, 
  the 
  first 
  of 
  winch 
  was 
  issued 
  in 
  1875, 
  consists 
  of 
  a 
  

   series 
  of 
  separate 
  publications 
  comprising 
  monographs 
  of 
  large 
  

   zoological 
  groups 
  and 
  other 
  general 
  systematic 
  treatises 
  (occasionally 
  

   in 
  several 
  volumes), 
  faunal 
  works, 
  reports 
  of 
  expeditions, 
  catalogues 
  

   of 
  type-specimens, 
  special 
  collections, 
  and 
  other 
  material 
  of 
  similar 
  

   nature. 
  The 
  majority 
  of 
  the 
  volumes 
  are 
  octavo 
  in 
  size, 
  but 
  a 
  

   quarto 
  size 
  has 
  been 
  adopted 
  in 
  a 
  few 
  instances 
  in 
  which 
  large 
  plates 
  

   were 
  regarded 
  as 
  indispensable. 
  In 
  the 
  Bulletin 
  series 
  appear 
  vol- 
  

   umes 
  under 
  the 
  heading 
  Contributions 
  from 
  the 
  United 
  States 
  National 
  

   Herbarium, 
  in 
  octavo 
  form, 
  published 
  by 
  the 
  National 
  Museum 
  since 
  

   1902, 
  which 
  contain 
  papers 
  relating 
  to 
  the 
  botanical 
  collections 
  of 
  

   the 
  Museum. 
  

  

  Alexander 
  Wetmore, 
  

   Assistant 
  Secretary, 
  Smithsonian 
  Institution. 
  

  

  Washington, 
  D. 
  C, 
  May 
  26, 
  1926. 
  

  

  