﻿412 
  

  

  Dr. 
  D. 
  Ferrier 
  on 
  the 
  Brain 
  of 
  Monkeys. 
  

  

  It 
  will 
  be 
  observed 
  that 
  in 
  some 
  cases 
  the 
  movement 
  is 
  only 
  partially 
  

   carried 
  out. 
  This 
  is 
  frequently 
  the 
  case, 
  and, 
  as 
  will 
  be 
  seen 
  in 
  the 
  sub- 
  

   sequent 
  details, 
  a 
  movement, 
  at 
  first 
  of 
  limited 
  extent, 
  gradually 
  merges 
  

   into 
  a 
  more 
  complex 
  one, 
  involving 
  numerous 
  muscles. 
  

  

  Circle 
  % 
  s 
  - 
  1 
  & 
  2. 
  This 
  embraces 
  the 
  upper 
  extremity 
  of 
  the 
  

  

  ascending 
  frontal 
  convolution, 
  and 
  also 
  stretches 
  across 
  the 
  fissure 
  of 
  

   Eolando, 
  so 
  as 
  to 
  include 
  the 
  anterior 
  division 
  of 
  the 
  upper 
  extremity 
  of 
  

   the 
  ascending 
  parietal 
  convolution. 
  

  

  In 
  the 
  description 
  reference 
  is 
  made 
  to 
  an 
  anterior 
  and 
  posterior 
  divi- 
  

   sion, 
  the 
  boundary 
  between 
  the 
  two 
  being 
  the 
  fissure 
  of 
  Eolando. 
  This 
  

   is 
  done 
  because, 
  though 
  on 
  analysis 
  movements 
  excited 
  by 
  stimulation 
  of 
  

   both 
  are 
  essentially 
  the 
  same, 
  they 
  are 
  less 
  distinctly 
  brought 
  out 
  by 
  

   stimulation 
  of 
  the 
  posterior 
  division 
  alone, 
  and 
  are 
  apt 
  to 
  merge 
  into 
  

  

  those 
  resulting 
  from 
  excitation 
  of 
  circle 
  

  

  Eesults 
  of 
  stimulation 
  of 
  the 
  posterior 
  division 
  : 
  — 
  

  

  I. 
  Not 
  explored. 
  

  

  II. 
  Not 
  explored. 
  

  

  III. 
  Not 
  explored. 
  

  

  IV. 
  Not 
  explored. 
  

  

  V. 
  In 
  this 
  case 
  there 
  were 
  movements 
  of 
  the 
  right 
  hind 
  leg 
  and 
  foot, 
  

  

  consisting 
  in 
  extension 
  and 
  then 
  flexion 
  and 
  abduction 
  of 
  the 
  

   thigh. 
  Nothing 
  more 
  definite 
  could 
  be 
  ascertained. 
  

  

  VI. 
  In 
  this 
  case 
  also 
  there 
  was 
  first 
  extension 
  of 
  the 
  left 
  thigh, 
  then 
  

   abduction 
  or 
  rotation 
  outwards, 
  while 
  the 
  foot 
  was 
  rotated 
  inwards, 
  

   the 
  toes 
  being 
  extended 
  and 
  spread 
  out. 
  

  

  VII. 
  Not 
  explored. 
  

  

  VIII. 
  Eotation 
  outwards 
  of 
  the 
  right 
  thigh, 
  and 
  rotation 
  inwards 
  of 
  

   the 
  leg 
  and 
  foot. 
  

  

  IX. 
  Not 
  explored. 
  

  

  X. 
  Not 
  explored. 
  

  

  XI. 
  Similar 
  to 
  VIII. 
  

  

  XII. 
  Not 
  explored. 
  

  

  XIII. 
  Not 
  explored. 
  

  

  Eesults 
  of 
  stimulation 
  of 
  the 
  anterior 
  division 
  (or 
  upper 
  part 
  of 
  the 
  

   ascending 
  frontal) 
  : 
  — 
  

  

  I. 
  Not 
  explored. 
  

  

  II. 
  At 
  first 
  the 
  left 
  thigh 
  was 
  extended, 
  and 
  the 
  leg 
  and 
  foot 
  slightly 
  

  

  rotated 
  inwards, 
  and 
  then, 
  on 
  continuation 
  of 
  the 
  electrization, 
  the 
  

   thigh 
  was 
  flexed 
  on 
  the 
  pelvis 
  and 
  rotated 
  outwards, 
  while 
  the 
  leg 
  

   and 
  foot 
  were 
  rotated 
  inwards, 
  the 
  toes 
  being 
  spread 
  out 
  in 
  a 
  

  

  