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  Dr. 
  D. 
  Ferrier 
  on 
  the 
  Brain 
  of 
  Monkeys. 
  

  

  Continuous 
  application 
  of 
  the 
  electrodes 
  for 
  several 
  seconds 
  

   caused 
  ultimately 
  firm 
  clenching 
  of 
  the 
  jaws, 
  retraction 
  of 
  the 
  

   angles 
  of 
  the 
  mouth 
  (particularly 
  the 
  left), 
  elevation 
  of 
  the 
  eye- 
  

   brows, 
  and 
  retraction 
  of 
  the 
  ears. 
  The 
  pupils 
  were 
  dilated, 
  eyes 
  

   widely 
  open, 
  and 
  the 
  head 
  thrown 
  back. 
  The 
  tail 
  became 
  ele- 
  

   vated, 
  the 
  limbs, 
  after 
  contortions 
  of 
  various 
  kinds, 
  became 
  rigidly 
  

   drawn 
  back, 
  the 
  arms 
  drawn 
  back 
  and 
  flexed 
  at 
  the 
  elbows 
  and 
  

   closely 
  approximated 
  to 
  the 
  sides. 
  A 
  complete 
  state 
  of 
  opistho- 
  

   tonus 
  was 
  induced. 
  The 
  dilatation 
  of 
  the 
  pupils 
  occurred 
  on 
  

   irritation 
  of 
  both 
  nates 
  and 
  testes 
  ; 
  the 
  screaming 
  &c. 
  only 
  on 
  

   irritation 
  of 
  the 
  testes. 
  

  

  VIII. 
  The 
  results 
  in 
  this 
  case 
  were 
  essentially 
  the 
  same 
  as 
  in 
  VI., 
  as 
  

   regards 
  the 
  dilatation 
  of 
  the 
  pupils, 
  howling, 
  and 
  rigidity 
  of 
  the 
  

   limbs, 
  &c. 
  

  

  IX. 
  As 
  before, 
  stimulation 
  of 
  the 
  anterior 
  tubercle 
  on 
  the 
  right 
  side 
  

   caused 
  elevation 
  of 
  the 
  eyebrows, 
  dilatation 
  of 
  the 
  pupils, 
  and 
  

   turning 
  up 
  of 
  the 
  eyes 
  to 
  the 
  left. 
  Irritation 
  of 
  the 
  ganglia 
  for 
  

   some 
  time 
  caused 
  a 
  condition 
  of 
  opisthotonus, 
  and 
  the 
  phenomena 
  

   described 
  under 
  VI. 
  

  

  Irritation 
  of 
  the 
  testes 
  caused 
  utterance 
  of 
  every 
  variety 
  of 
  

   barking 
  and 
  howling, 
  ultimately 
  trismus 
  and 
  general 
  opisthotonus. 
  

  

  X. 
  Exactly 
  as 
  in 
  IX. 
  

  

  XII. 
  As 
  before, 
  irritation 
  of 
  the 
  testes 
  caused 
  barking 
  and 
  howling. 
  

  

  "When 
  the 
  animal 
  was 
  nearly 
  dead 
  irritation 
  of 
  the 
  testes 
  caused 
  

   only 
  powerful 
  retraction 
  of 
  the 
  angles 
  of 
  the 
  mouth, 
  so 
  as 
  to 
  show 
  

   the 
  firmly 
  clenched 
  teeth. 
  

  

  XIII. 
  In 
  this 
  case 
  the 
  results 
  as 
  to 
  the 
  nates 
  and 
  testes 
  were 
  in 
  every 
  

   respect 
  similar 
  to 
  those 
  already 
  detailed 
  in 
  the 
  former 
  cases. 
  

  

  Cerebellum. 
  

  

  Experiments 
  were 
  also 
  made 
  on 
  the 
  cerebellum 
  in 
  five 
  monkeys, 
  some 
  

   of 
  those 
  already 
  alluded 
  to, 
  as 
  well 
  as 
  others. 
  Further 
  than 
  stating 
  that 
  

   the 
  results 
  which 
  I 
  have 
  already 
  described 
  (West-Biding 
  Eeports) 
  in 
  the 
  

   case 
  of 
  rabbits, 
  viz. 
  alteration 
  of 
  the 
  optic 
  axis 
  in 
  different 
  directions 
  

   according 
  to 
  the 
  part 
  stimulated, 
  are 
  confirmed 
  in 
  the 
  case 
  of 
  monkeys, 
  I 
  

   do 
  not 
  at 
  present 
  intend 
  entering 
  into 
  fuller 
  details, 
  but 
  reserve 
  a 
  full 
  

   consideration 
  of 
  this 
  subject 
  for 
  a 
  future 
  paper. 
  

  

  There 
  is 
  great 
  difficulty 
  in 
  ascertaining 
  the 
  exact 
  causation 
  and 
  relation 
  

   of 
  the 
  phenomena 
  which 
  are 
  manifested 
  on 
  irritation 
  of 
  the 
  cerebellum 
  

   along 
  with 
  movements 
  of 
  the 
  eyeballs. 
  Among 
  others, 
  it 
  may 
  be 
  stated, 
  

   are 
  certain 
  movements 
  of 
  the 
  limbs 
  and 
  trunk, 
  which 
  I 
  interpret 
  as 
  indi- 
  

   cations 
  of 
  an 
  attempt 
  to 
  adjust 
  the 
  equilibrium 
  of 
  the 
  body 
  in 
  harmony 
  

   with 
  the 
  ocular 
  movements. 
  On 
  this 
  point, 
  however, 
  further 
  experi- 
  

   ments 
  are 
  necessary. 
  

  

  An 
  attempt 
  to 
  analyze 
  and 
  interpret 
  the 
  significance 
  of 
  these 
  results 
  

   will 
  be 
  made 
  in 
  the 
  next 
  communication. 
  

  

  