﻿ADVERTISEMENT. 
  

  

  The 
  exteusion 
  of 
  the 
  scope 
  of 
  the 
  Natioual 
  Museum 
  during 
  recent 
  

   years 
  and 
  the 
  activity 
  of 
  the 
  collectors 
  employed 
  in 
  its 
  interest 
  have 
  

   caused 
  a 
  great 
  increase 
  in 
  the 
  amount 
  of 
  material 
  in 
  its 
  possession. 
  

   Many 
  of 
  the 
  objects 
  gathered 
  are 
  of 
  a 
  novel 
  and 
  imi)ortant 
  character, 
  

   and 
  serve 
  to 
  throw 
  a 
  new 
  light 
  upon 
  the 
  study 
  of 
  nature 
  and 
  of 
  man. 
  

  

  The 
  importance 
  to 
  science 
  of 
  prompt 
  publication 
  of 
  descriptions 
  of 
  

   this 
  material 
  led 
  to 
  the 
  establishment, 
  in 
  1878, 
  of 
  the 
  present 
  series 
  

   of 
  publications, 
  entitled 
  "Proceedings 
  of 
  the 
  United 
  States 
  National 
  

   Museum,-' 
  the 
  distinguishing 
  peculiarity 
  of 
  Miiich 
  is 
  that 
  the 
  articles 
  

   are 
  published 
  in 
  pamphlet 
  form 
  as 
  fast 
  as 
  completed 
  and 
  in 
  advance 
  of 
  

   the 
  bound 
  voluu^e. 
  The 
  i)resent 
  volume 
  constitutes 
  the 
  twentieth 
  

   of 
  the 
  series. 
  

  

  Tlie 
  articles 
  in 
  this 
  series 
  consist 
  : 
  First, 
  of 
  papers 
  prejiared 
  by 
  the 
  

   scientific 
  corps 
  of 
  the 
  National 
  Museum 
  ; 
  secondly, 
  of 
  papers 
  by 
  others, 
  

   founded 
  upon 
  the 
  collections 
  in 
  the 
  National 
  Museum; 
  and, 
  finally, 
  

   of 
  facts 
  and 
  memoranda 
  from 
  the 
  correspondence 
  of 
  the 
  Smithsonian 
  

   Institution. 
  

  

  The 
  Bulletin 
  of 
  the 
  National 
  Museum, 
  the 
  publication 
  of 
  which 
  was 
  

   commenced 
  in 
  1875, 
  consists 
  of 
  elaborate 
  papers 
  based 
  upon 
  the 
  collec- 
  

   tions 
  of 
  the 
  Museum, 
  reports 
  of 
  expeditions, 
  etc., 
  while 
  the 
  Proceedings 
  

   facilitate 
  the 
  prompt 
  publication 
  of 
  freshly 
  acquired 
  facts 
  relating 
  to 
  

   biology, 
  anthropology, 
  and 
  geolog}^, 
  descriptions 
  of 
  restricted 
  groups 
  

   of 
  animals 
  and 
  plants, 
  the 
  discussion 
  of 
  particular 
  questions 
  relative 
  

   to 
  the 
  synonomy 
  of 
  si^ecies, 
  and 
  the 
  diaries 
  of 
  minor 
  expeditions. 
  

  

  Other 
  papers 
  of 
  more 
  general 
  popular 
  interest 
  are 
  printed 
  in 
  the 
  

   Appendix 
  to 
  the 
  Annual 
  Report. 
  

  

  Papers 
  intended 
  for 
  publication 
  in 
  the 
  Proceedings 
  and 
  Bulletin 
  of 
  

   the 
  National 
  Museum 
  are 
  referred 
  to 
  the 
  Advisory 
  Committee 
  on 
  Pub- 
  

   lications, 
  composed 
  as 
  follows: 
  Frederick 
  W. 
  True 
  (chairman), 
  Marcus 
  

   Benjamin 
  (editor), 
  James 
  E. 
  Benedict, 
  Otis 
  T. 
  Mason, 
  Leonhard 
  

   Stejneger, 
  and 
  Lester 
  F. 
  Ward. 
  

  

  S. 
  P. 
  Langley, 
  

   Secretary 
  of 
  the 
  Smithsonian 
  Institution, 
  

  

  jy 
  

  

  bn'i 
  

  

  