﻿1875.] 
  

  

  Action 
  of 
  the 
  Crotalus-poison, 
  fyc. 
  

  

  273 
  

  

  with 
  the 
  object 
  of 
  testing 
  the 
  influence 
  of 
  snake-poison 
  on 
  ciliary 
  action, 
  

   especially 
  in 
  reference 
  to 
  its 
  comparative 
  action^on 
  vegetable 
  protoplasm, 
  

   as 
  will 
  be 
  seen 
  by 
  his 
  remarks. 
  

  

  Experiment 
  XXI. 
  

  

  Influence 
  of 
  Cobra-poison 
  on 
  Ciliary 
  Action. 
  

  

  June 
  29t7i, 
  1874. 
  — 
  Ciliated 
  epithelium 
  from 
  the 
  frog's 
  mouth 
  was 
  treated 
  

   with 
  a 
  solution 
  of 
  cobra-poison 
  and 
  examined 
  under 
  the 
  microscope. 
  

   At 
  1.35 
  p.m., 
  when 
  examined, 
  the 
  action 
  of 
  the 
  cilia 
  was 
  vigorous. 
  

   At 
  1.45 
  it 
  was 
  much 
  diminished. 
  

   At 
  1,55 
  it 
  had 
  entirely 
  ceased. 
  

  

  Experiment 
  XXII. 
  

  

  Ciliated 
  epithelium 
  placed 
  under 
  microscope 
  ; 
  one 
  part 
  was 
  treated 
  with 
  

   water, 
  the 
  other 
  with 
  the 
  poisoned 
  solution. 
  

  

  At 
  2.10 
  p.m. 
  ciliary 
  motion 
  vigorous 
  in 
  both, 
  perhaps 
  more 
  so 
  in 
  that 
  

   subjected 
  to 
  the 
  poisoned 
  solution. 
  

  

  2.18. 
  Non-poisoned 
  cilia 
  active. 
  Poisoned 
  cilia 
  very 
  feeble. 
  

  

  2.20. 
  Non-poisoned 
  cilia 
  still 
  active. 
  Poisoned 
  cilia 
  very 
  feeble. 
  

  

  2.24. 
  Non-poisoned 
  cilia 
  active. 
  Poisoned 
  cilia 
  very 
  languid. 
  

  

  2.30. 
  Non-poisoned 
  cilia 
  still 
  active. 
  Poisoned 
  cilia 
  have 
  entirely 
  

   ceased 
  to 
  act. 
  

  

  It 
  is 
  evident 
  from 
  this 
  that 
  the 
  poison 
  first 
  stimulates 
  and 
  then 
  destroys 
  

   the 
  activity 
  of 
  the 
  ciliary 
  action. 
  

  

  Experiment 
  XXIII. 
  

  

  August 
  14:t7i. 
  — 
  Prog's 
  blood 
  placed 
  in 
  salt 
  solution, 
  *75 
  per 
  cent., 
  at 
  1.25 
  

   p.m. 
  on 
  warm 
  stage, 
  and 
  then 
  subjected 
  to 
  the 
  action 
  of 
  cobra-poison. 
  

  

  At 
  first 
  the 
  amoeboid 
  movements 
  of 
  white 
  corpuscles 
  went 
  on 
  vigo- 
  

   rously. 
  At 
  2 
  p.m. 
  they 
  had 
  ceased, 
  or 
  very 
  nearly 
  so, 
  in 
  all 
  that 
  appeared 
  

   in 
  the 
  field. 
  

  

  2.30. 
  All 
  movement 
  had 
  entirely 
  ceased. 
  The 
  red 
  corpuscles 
  seemed 
  

   more 
  flattened, 
  the 
  nucleus 
  more 
  visible, 
  and 
  the 
  edges 
  better 
  defined, 
  

   assuming 
  a 
  pointed 
  and 
  more 
  oval 
  form 
  than 
  usual. 
  

  

  Experiment 
  XXIV. 
  

  

  August 
  2ot7i, 
  1874. 
  — 
  Newts' 
  blood 
  examined 
  under 
  J 
  object-glass 
  on 
  

   hot 
  stage, 
  white 
  corpuscles 
  moving 
  slowly. 
  Cobra-poison 
  applied, 
  but 
  no 
  

   perceptible 
  change 
  observed. 
  

  

  The 
  following 
  communications 
  were 
  received 
  from 
  Mr. 
  C. 
  Darwin 
  on 
  

   the 
  action 
  of 
  some 
  of 
  the 
  same 
  cobra-poison 
  on 
  vegetable 
  protoplasm 
  : 
  — 
  

  

  " 
  You 
  will 
  perhaps 
  like 
  to 
  hear 
  how 
  it 
  acted 
  on 
  Drosera. 
  I 
  made 
  a 
  

   solution 
  of 
  | 
  gr. 
  to 
  5ij 
  of 
  water. 
  A 
  minute 
  drop 
  on 
  a 
  small 
  pin's 
  head 
  

  

  