﻿1875.] 
  Influence 
  of 
  Electricity 
  on 
  the 
  Hearts 
  of 
  Mollusks. 
  343 
  

  

  

  

  FiglZ 
  

  

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  The 
  beats 
  a, 
  (3 
  commenced 
  at 
  the 
  auricular 
  end 
  of 
  the 
  ventricle 
  ; 
  the 
  beat 
  y, 
  

   due 
  to 
  disappearance 
  of 
  anelectrotonus, 
  commenced 
  at 
  the 
  aortic 
  end 
  of 
  the 
  

   ventricle. 
  

  

  Fig. 
  11. 
  Same 
  arrangement 
  as 
  fig. 
  10. 
  Eesistance 
  in 
  the 
  resistance-shunt 
  100 
  ohms. 
  

  

  The 
  beat 
  at 
  a, 
  due 
  to 
  the 
  instantaneous 
  make 
  and 
  break 
  at 
  z, 
  was 
  normal 
  in 
  

   character, 
  i. 
  e. 
  started 
  from 
  the 
  auricular 
  end 
  of 
  the 
  ventricle. 
  The 
  beats 
  j3, 
  y, 
  6 
  

   also 
  started 
  from 
  the 
  auricular 
  end. 
  The 
  beat 
  e 
  started 
  from 
  the 
  aortic 
  end 
  of 
  

   the 
  ventricle. 
  

  

  Fig. 
  12. 
  Constant 
  current 
  applied 
  to 
  the 
  heart 
  at 
  rest. 
  

  

  Auricle 
  still 
  attached 
  to 
  ventricle. 
  Anode 
  placed 
  at 
  auricle, 
  kathode 
  at 
  aortic 
  

   end 
  of 
  ventricle. 
  The 
  whole 
  of 
  the 
  current 
  from 
  a 
  single 
  Daniell's 
  cell 
  was 
  sent 
  

   through 
  the 
  heart. 
  Otherwise 
  the 
  same 
  arrangement 
  as 
  in 
  figs. 
  10, 
  12, 
  & 
  13. 
  

  

  The 
  beat 
  a, 
  due 
  to 
  the 
  instantaneous 
  make 
  and 
  break 
  at 
  z, 
  was 
  faint, 
  starting 
  

   from 
  the 
  aortic 
  end 
  of 
  the 
  ventricle. 
  j3 
  was 
  a 
  stronger 
  beat, 
  starting 
  also 
  from 
  

   the 
  aortic 
  end 
  of 
  the 
  ventricle, 
  y 
  was 
  a 
  strong 
  beat, 
  starting 
  from 
  the 
  auricuh 
  r 
  

   end 
  of 
  the 
  ventricle. 
  

  

  Fig. 
  13. 
  Same 
  arrangement 
  as 
  figs. 
  10 
  & 
  11. 
  

  

  The 
  whole 
  of 
  the 
  current 
  from 
  a 
  single 
  Daniell's 
  cell 
  was 
  thrown 
  in. 
  The 
  beats 
  

   a, 
  (3, 
  y, 
  8 
  started 
  from 
  the 
  auricular 
  end, 
  and 
  e 
  from 
  the 
  aortic 
  end 
  of 
  the 
  

   ventricle. 
  

  

  