﻿Dr. 
  D. 
  Ferrier 
  on 
  the 
  Brain 
  of 
  Monkeys. 
  417 
  

  

  Continued 
  in 
  a 
  choreic 
  manner 
  after 
  stimulation. 
  

   c. 
  Same 
  result 
  as 
  d. 
  

  

  b. 
  Extension 
  of 
  the 
  fingers, 
  but 
  more 
  especially 
  of 
  the 
  thumb. 
  

   a. 
  Thumb 
  only 
  is 
  extended. 
  

  

  Spasmodic 
  jerking 
  of 
  the 
  thumb 
  continued 
  several 
  seconds 
  after 
  

   withdrawal 
  of 
  the 
  electrodes. 
  

  

  III. 
  a. 
  Clenching 
  of 
  the 
  fist. 
  The 
  movement 
  began 
  with 
  the 
  thumb, 
  

   which 
  was 
  first 
  adducted. 
  

  

  b. 
  As 
  before, 
  clenching 
  of 
  the 
  fist 
  ; 
  at 
  the 
  same 
  time 
  the 
  

   extensors 
  of 
  the 
  wrist 
  and 
  fingers 
  were 
  seen 
  to 
  be 
  contracted. 
  

  

  c. 
  Momentary 
  application 
  of 
  the 
  electrodes 
  caused 
  adduction 
  of 
  

   the 
  thumb, 
  followed- 
  on 
  longer 
  stimulation 
  by 
  clenching 
  of 
  the 
  

   whole 
  fist 
  and 
  slight 
  pronation 
  of 
  the 
  hand. 
  

  

  After 
  several 
  other 
  regions 
  had 
  been 
  explored, 
  these 
  points 
  

   were 
  again 
  stimulated 
  in 
  succession. 
  

  

  The 
  second 
  result 
  at 
  point 
  d 
  was 
  extension 
  of 
  the 
  thumb 
  and 
  

   fingers 
  instead 
  of 
  flexion. 
  

  

  A 
  second 
  stimulation 
  of 
  point 
  b 
  caused, 
  first, 
  adduction 
  of 
  all 
  the 
  

   fingers, 
  then 
  extension 
  of 
  the 
  wrist 
  and 
  flexion 
  of 
  the 
  distal 
  pha- 
  

   langes, 
  the 
  proximal 
  phalanges 
  not 
  being 
  flexed 
  till 
  the 
  wrist 
  was 
  

   fully 
  extended. 
  

  

  The 
  repeated 
  application 
  of 
  the 
  electrodes 
  was 
  followed 
  in 
  this 
  

   animal 
  by 
  an 
  epileptiform 
  fit, 
  affecting 
  both 
  sides 
  of 
  the 
  body 
  and 
  

   lasting 
  for 
  three 
  minutes. 
  

  

  IV. 
  a. 
  Abduction 
  of 
  the 
  thumb. 
  

  

  At 
  the 
  same 
  time 
  the 
  right 
  angle 
  of 
  the 
  mouth 
  was 
  retracted, 
  

   owing, 
  as 
  will 
  be 
  seen, 
  to 
  the 
  proximity 
  of 
  the 
  centre 
  for 
  the 
  

   platysma. 
  

  

  b. 
  At 
  first 
  extension 
  of 
  the 
  thumb, 
  then, 
  on 
  longer 
  irritation, 
  

   extension 
  of 
  the 
  wrist 
  and 
  flexion 
  of 
  the 
  fingers. 
  

  

  c. 
  Thumb 
  adducted, 
  and 
  then 
  firm 
  clenching 
  of 
  the 
  fist. 
  

  

  d. 
  Clenching 
  of 
  the 
  fist 
  and 
  pronation 
  of 
  the 
  hand. 
  

  

  V. 
  a. 
  One 
  application 
  of 
  the 
  electrodes 
  caused 
  extension 
  of 
  the 
  thumb 
  ; 
  

  

  another 
  caused 
  adduction 
  of 
  the 
  thumb 
  and 
  clenching 
  of 
  the 
  

   fist, 
  with 
  extension 
  of 
  the 
  wrist. 
  

  

  b. 
  Clenching 
  of 
  the 
  fist 
  and 
  extension 
  of 
  the 
  wrist, 
  as 
  before. 
  

  

  c. 
  Clenching 
  of 
  the 
  fist 
  as 
  before, 
  with 
  complete 
  pronation 
  of 
  

   the 
  hand. 
  

  

  d. 
  Clenching 
  of 
  the 
  fist 
  repeated, 
  but 
  complicated 
  with 
  the 
  

   action 
  of 
  the 
  latissimus 
  dorsi 
  and 
  backward 
  extension 
  of 
  the 
  

   arm. 
  

  

  The 
  reason 
  of 
  this 
  is 
  the 
  proximity 
  of 
  the 
  point 
  d 
  to 
  circle 
  

  

  VI. 
  a, 
  b, 
  c, 
  d. 
  A 
  similar 
  result 
  in 
  all, 
  viz. 
  flexion 
  of 
  the 
  fingers 
  and 
  

   extension 
  of 
  the 
  carpus. 
  

  

  