﻿1875.] 
  

  

  Action 
  of 
  the 
  Crotalus-poison, 
  fyc. 
  

  

  277 
  

  

  Experiment 
  XXXIII. 
  

   A 
  little 
  dilate 
  cobra-poison 
  was 
  added 
  to 
  a 
  piece 
  of 
  the 
  mantle 
  of 
  a 
  fresh- 
  

   water 
  mussel. 
  The 
  cilia 
  began 
  immediately 
  to 
  move 
  much 
  more 
  rapidly. 
  

   This 
  was 
  watched 
  for 
  some 
  time. 
  Ciliary 
  motion 
  not 
  affected, 
  or 
  at 
  all 
  

   events 
  not 
  arrested, 
  after 
  more 
  than 
  half 
  an 
  hour. 
  

  

  Experiment 
  XXXIV. 
  

  

  December 
  10th, 
  1874. 
  — 
  A 
  piece 
  of 
  the 
  gills 
  of 
  a 
  freshwater 
  mussel 
  

   placed 
  under 
  the 
  microscope 
  and 
  a 
  little 
  cobra-poison 
  added 
  at 
  10.40 
  p.m. 
  

   The 
  cilia 
  were 
  extremely 
  active. 
  

  

  At 
  10.55 
  still 
  active. 
  

  

  11.5. 
  Several 
  ciliated 
  amoeboid 
  masses 
  are 
  now 
  quiet 
  instead 
  of 
  rolling 
  

   over 
  and 
  over 
  as 
  they 
  did, 
  but 
  the 
  cilia 
  on 
  their 
  surface 
  are 
  still 
  moving. 
  

  

  11.15. 
  The 
  cilia 
  on 
  these 
  Infusoria 
  have 
  now 
  nearly 
  all 
  stopped. 
  A 
  

   few 
  are 
  moving 
  slowly, 
  whilst 
  those 
  on 
  the 
  gills 
  are 
  but 
  little 
  affected. 
  

  

  11.55. 
  Cilia 
  on 
  the 
  gills 
  are 
  still 
  quite 
  active. 
  Those 
  on 
  the 
  ciliated 
  

   bodies 
  still 
  moving, 
  rather 
  more 
  actively 
  than 
  before. 
  

  

  1.30. 
  Cilia 
  on 
  gills 
  have 
  become 
  much 
  more 
  sharply 
  outlined. 
  Many 
  

   are 
  standing 
  still, 
  though 
  many 
  still 
  move 
  briskly. 
  

  

  Experiment 
  XXXV. 
  

  

  To 
  another 
  specimen 
  a 
  strong 
  solution 
  of 
  cobra-poison 
  was 
  added 
  at 
  

   10.50. 
  

  

  1.30. 
  Cilia 
  still 
  moving. 
  

  

  Experiment 
  XXXVI. 
  

  

  A 
  third 
  specimen 
  was 
  laid 
  in 
  an 
  almost 
  syrupy 
  solution 
  of 
  dried 
  cobra- 
  

   poison 
  at 
  11.28. 
  

  

  At 
  11.40 
  no 
  effect 
  observable. 
  

  

  1.30. 
  Some 
  have 
  stopped, 
  but 
  numbers 
  are 
  still 
  moving 
  quite 
  briskly. 
  

   In 
  this 
  case 
  the 
  poison 
  seemed 
  not 
  to 
  have 
  any 
  action 
  on 
  the 
  ciliary 
  

   motion. 
  

  

  Experiment 
  XXXVII. 
  

  

  January 
  6th, 
  1875. 
  — 
  At 
  3.40 
  some 
  diluted 
  cobra-poison 
  added 
  to 
  VaU 
  

   lisneria. 
  Circulation 
  going 
  on 
  vigorously. 
  About 
  yL- 
  grain 
  in 
  three 
  

   drops 
  of 
  water. 
  

  

  3.58. 
  The 
  movements 
  are 
  unchanged. 
  

  

  5 
  p.m. 
  Movements 
  going 
  on 
  as 
  before. 
  

  

  Experiment 
  XXXVIII. 
  

  

  Added 
  some 
  solution 
  of 
  cobra-poison 
  at 
  4 
  p.m. 
  to 
  another 
  specimen 
  of 
  

   Vallisneria. 
  

   4.10. 
  No 
  change. 
  

  

  4.45. 
  Circulation 
  goes 
  on 
  vigorously. 
  

  

  4.55. 
  Perhaps 
  rather 
  less 
  brisk 
  in 
  their 
  movements 
  . 
  

  

  