﻿EPITHELIAL 
  ISLETS 
  OF 
  THE 
  PANCREAS 
  IN 
  TELEOSTEI. 
  379 
  

  

  The 
  Epithelial 
  Islets 
  of 
  the 
  Pancreas 
  in 
  Teleostei. 
  

  

  By 
  

  

  John 
  Reniiie, 
  D.Sc, 
  F.R.M.S., 
  

  

  A!^si3tant 
  in 
  Zoology, 
  Aberdeen 
  University. 
  

  

  With 
  Plates 
  2G, 
  27, 
  & 
  28. 
  

  

  Introductory 
  and 
  Historical. 
  

  

  The 
  question 
  of 
  the 
  anatomical 
  and 
  functional 
  nature 
  

   of 
  the 
  islet-like 
  groups 
  of 
  cells 
  occurriug 
  within 
  the 
  pancreas 
  

   of 
  vertebrate 
  animals 
  has 
  beeu 
  studied 
  by 
  a 
  large 
  number 
  of 
  

   investigators 
  since 
  attention 
  was 
  first 
  directed 
  to 
  them 
  by 
  

   Langerhans 
  in 
  1869. 
  'J'hese 
  inquiries 
  have 
  for 
  the 
  most 
  part 
  

   been 
  confiued 
  to 
  the 
  higher 
  vertebrates, 
  and 
  summaries 
  of 
  

   their 
  results 
  have 
  already 
  been 
  given 
  by 
  other 
  writers 
  

   (Laguesse, 
  1894; 
  Oppel, 
  1900). 
  Notwithstanding 
  the 
  some- 
  

   what 
  extensive 
  literature 
  of 
  the 
  subject, 
  there 
  is 
  so 
  much 
  

   disagreement 
  as 
  to 
  the 
  real 
  nature 
  of 
  these 
  bodies 
  that 
  further 
  

   inquiry 
  was 
  desirable. 
  Oppel 
  (13) 
  wrote 
  in 
  1900, 
  " 
  Was 
  die 
  

   Bedeutung 
  der 
  intertubularen 
  Zellhaufen 
  aulangt, 
  so 
  ist 
  

   dieselbe, 
  so 
  viel 
  audi 
  daruber 
  geschrieben 
  wurde 
  und 
  so 
  viele 
  

   Ansichten 
  auch 
  daruber 
  bestehen, 
  noch 
  nicht 
  ganz 
  erklart." 
  

  

  Although 
  much 
  has 
  been 
  written 
  regarding 
  these 
  cell- 
  

  

  Tlie 
  present 
  research 
  has 
  been 
  carried 
  out 
  in 
  several 
  laboratories 
  and 
  upon 
  

   material 
  obtained 
  from 
  various 
  sources. 
  Cordial 
  thanks 
  are 
  due 
  to 
  Prof. 
  

   Mcintosh, 
  F.R.S., 
  for 
  the 
  valuable 
  privilege 
  of 
  the 
  use 
  of 
  the 
  Gatty 
  Marine 
  

   Laboratory, 
  St. 
  Andrews, 
  and 
  to 
  Professors 
  Heincke 
  and 
  Ehrenbaum, 
  of 
  

   Heligoland, 
  not 
  only 
  for 
  the 
  free 
  use 
  of 
  the 
  laboratory 
  there, 
  with 
  its 
  abundant 
  

   supply 
  of 
  material, 
  but 
  also 
  for 
  tiieir 
  friendly 
  treatment 
  during 
  my 
  stay 
  in 
  the 
  

   institute 
  under 
  their 
  charge. 
  I 
  acknowledge 
  also 
  the 
  assistance 
  of 
  a 
  grant 
  

   from 
  the 
  Carnegie 
  Trustees 
  in 
  defraying 
  part 
  of 
  the 
  cost 
  of 
  material 
  and 
  pre- 
  

   paration 
  for 
  publication 
  of 
  this 
  research. 
  

  

  