﻿176 
  Mv. 
  A. 
  Sanders 
  on 
  the 
  

  

  a 
  small 
  piece 
  of 
  the 
  molecular 
  layer 
  is 
  left 
  on 
  their 
  summit, 
  

   forming 
  a 
  sort 
  of 
  rudimentary 
  resemblance 
  between 
  the 
  two. 
  

  

  The 
  molecular 
  layer 
  shows 
  as 
  its 
  most 
  conspicuous 
  element 
  

   the 
  processes 
  of 
  the 
  Purkinje 
  cells, 
  which 
  pass 
  towards 
  the 
  outer 
  

   surface 
  and 
  there 
  form 
  a 
  comparatively 
  coarse 
  netwoi*k, 
  which 
  

   in 
  some 
  places 
  gives 
  a 
  diamond-shaped 
  pattern, 
  like 
  cross 
  

   hatching 
  ; 
  this 
  is 
  caused 
  by 
  the 
  terminal 
  branches 
  of 
  the 
  

   processes 
  dividing 
  dichotomously 
  at 
  their 
  extremities 
  and 
  

   so 
  obliquely 
  crossing 
  each 
  other; 
  the 
  fibrils 
  resulting 
  from 
  

   this 
  division 
  are 
  much 
  larger 
  than 
  those 
  which 
  form 
  a 
  minute 
  

   network, 
  which 
  fills 
  up 
  the 
  intervals 
  between 
  them 
  ; 
  the 
  latter 
  

   have 
  a 
  general 
  tendency 
  to 
  a 
  longitudinal 
  direction, 
  especially 
  

   well 
  marked 
  towards 
  the 
  outer 
  surface. 
  

  

  In 
  addition 
  to 
  these 
  two 
  sets 
  of 
  fibrillar 
  network 
  there 
  are 
  

   to 
  be 
  found 
  sparsely 
  scattered 
  through 
  the 
  molecular 
  layer 
  oval 
  

   and 
  rounded 
  cells, 
  some 
  of 
  which 
  give 
  off 
  processes 
  from 
  their 
  

   longer 
  axis. 
  The 
  largest 
  measure 
  23 
  fj, 
  long 
  by 
  0*0155 
  millim. 
  

   wide 
  and 
  their 
  size 
  varies 
  between 
  that 
  and 
  the 
  smaller 
  ones, 
  

   which 
  are 
  0*0155 
  millim. 
  long 
  by 
  13 
  fi 
  wide. 
  The 
  spherical 
  

   cells 
  have 
  the 
  appearance 
  of 
  those 
  found 
  in 
  the 
  granular 
  

   layer, 
  and 
  have 
  about 
  the 
  same 
  diameter, 
  some 
  being 
  slightly 
  

   larger. 
  I 
  could 
  not 
  make 
  out 
  that 
  they 
  gave 
  off 
  any 
  pro- 
  

   cesses. 
  

  

  In 
  addition 
  to 
  these 
  there 
  occur 
  also 
  cells 
  of 
  a 
  more 
  elon- 
  

   gated 
  type, 
  approaching 
  the 
  fusiform 
  ; 
  these 
  measure 
  24 
  fi 
  

   long 
  by 
  0*0114 
  millim. 
  broad; 
  they 
  have 
  a 
  large 
  granular 
  

   nucleus, 
  but 
  no 
  nucleolus 
  can 
  be 
  detected 
  ; 
  cells 
  are 
  also 
  seen 
  

   which 
  form 
  a 
  transition 
  to 
  the 
  oval 
  shape. 
  

  

  Thus 
  there 
  is 
  found 
  in 
  the 
  molecular 
  layer 
  a 
  regular 
  tran- 
  

   sition 
  from 
  the 
  spherical, 
  passing 
  through 
  the 
  oval, 
  to 
  the 
  

   fusiform 
  type 
  of 
  cells 
  ; 
  the 
  latter 
  give 
  off 
  a 
  process 
  from 
  each 
  

   end, 
  the 
  one 
  directed 
  towards 
  the 
  outer 
  surface 
  being 
  the 
  

   thicker 
  of 
  the 
  two 
  and 
  traceable 
  as 
  far 
  as 
  the 
  outer 
  edge, 
  

   where 
  it 
  may 
  be 
  seen 
  to 
  join 
  the 
  network 
  of 
  the 
  radial 
  pro- 
  

   cesses 
  of 
  the 
  Purkinje 
  cells. 
  

  

  Other 
  cells 
  are 
  to 
  be 
  observed 
  which 
  are 
  situated 
  close 
  to 
  

   the 
  outer 
  edge 
  ; 
  they 
  resemble 
  the 
  oval 
  type 
  ; 
  in 
  some 
  places 
  

   they 
  form 
  a 
  thin 
  layer. 
  

  

  The 
  external 
  surface 
  of 
  the 
  cerebellum 
  is 
  bounded 
  by 
  an 
  

   epithelium 
  formed 
  of 
  rounded 
  cells, 
  which 
  carry 
  on 
  their 
  ex- 
  

   ternal 
  surface 
  flat 
  membranous 
  expansions, 
  corresponding 
  to 
  

   but 
  more 
  substantial 
  than 
  those 
  found 
  on 
  the 
  inner 
  surface 
  

   facing 
  the 
  ventricle. 
  This 
  exterior 
  layer 
  of 
  epithelial 
  cells 
  

   resembles 
  the 
  palissade 
  cells 
  (" 
  Stiftzelle 
  " 
  of 
  Stieda) 
  in 
  the 
  

   Plagiostomata 
  ; 
  but 
  their 
  processes 
  which 
  penetrate 
  the 
  

   molecular 
  layer 
  are 
  much 
  less 
  marked. 
  

  

  