﻿Circulation 
  of 
  the 
  Blood. 
  

  

  143 
  

  

  follow 
  the 
  a^ove 
  law 
  exactly, 
  the 
  following 
  are 
  the 
  results 
  obtained 
  by 
  

   measuring 
  the 
  carotid 
  tracings 
  : 
  — 
  

  

  

  Ratio 
  borne 
  by 
  sphygraosystole 
  to 
  whole 
  beat, 
  as 
  

  

  Pulse-rate. 
  

  

  Found 
  

  

  Calculated 
  

  

  

  by 
  measurement. 
  

  

  from 
  radial 
  equation. 
  

  

  67 
  

  

  2-899 
  

  

  2-84 
  

  

  68 
  

  

  2-827, 
  2-6 
  

  

  2-8 
  

  

  72 
  

  

  2-7144 
  

  

  2-7 
  

  

  77 
  

  

  2-583 
  

  

  2-59 
  

  

  77 
  

  

  2-594 
  

  

  2-59 
  

  

  In 
  another 
  subject, 
  aetat. 
  22, 
  the 
  following 
  are 
  the 
  results 
  : 
  — 
  

  

  77 
  

  

  2- 
  6625 
  

  

  2-595 
  

  

  78 
  

  

  2-575 
  

  

  2-575 
  

  

  85 
  

  

  2-443 
  

  

  2-44 
  

  

  "With 
  regard 
  to 
  the 
  posterior 
  tibial 
  artery, 
  most 
  of 
  the 
  results 
  were 
  

   obtained 
  by 
  the 
  employment 
  of 
  the 
  double 
  sphygmograph, 
  to 
  be 
  de- 
  

   scribed 
  further 
  on, 
  in 
  which 
  the 
  superposition 
  of 
  the 
  simultaneous 
  

   posterior 
  tibial 
  trace 
  on 
  that 
  from 
  the 
  radial 
  artery 
  showed 
  that 
  the 
  

   interval 
  between 
  the 
  commencing 
  primary 
  and 
  dicrotic 
  rises 
  is 
  the 
  same 
  

   in 
  both. 
  The 
  following 
  are 
  a 
  few 
  independent 
  measurements 
  from 
  

   tracings 
  from 
  the 
  artery 
  behind 
  the 
  ankle 
  : 
  — 
  

  

  Pulse-rate. 
  

  

  Proportion 
  borne 
  by 
  first 
  

   part 
  to 
  whole 
  

   beat 
  in 
  ankle 
  trace. 
  

  

  Proportion 
  borne 
  by 
  

  

  first 
  part 
  to 
  

   whole 
  beat 
  in 
  radial 
  

   trace 
  (approximately). 
  

  

  70 
  

  

  2-7 
  

  

  2-76 
  

  

  73 
  

  

  2-675 
  

  

  2-685 
  

  

  80 
  

  

  2-596 
  

  

  2-525 
  

  

  82 
  

  

  2-4575 
  

  

  2-5 
  

  

  82-5 
  

  

  2-517 
  

  

  2-495 
  

  

  88 
  

  

  2-378 
  

  

  2-378 
  

  

  Corollary. 
  — 
  The 
  length 
  of 
  the 
  interval 
  between 
  the 
  primary 
  and 
  

   secondary 
  rises 
  being 
  exactly 
  the 
  same 
  in 
  the 
  carotid, 
  radial, 
  and 
  pos- 
  

   terior 
  tibial 
  arteries, 
  which 
  are 
  three 
  vessels 
  at 
  very 
  different 
  distances 
  

   from 
  the 
  heart, 
  it 
  is 
  evident 
  that 
  the 
  length 
  of 
  this 
  interval 
  is 
  constant 
  

   throughout 
  the 
  larger 
  arteries, 
  and 
  must 
  he 
  of 
  the 
  same 
  duration 
  at 
  the 
  

   origin 
  of 
  the 
  aorta 
  that 
  it 
  is 
  in 
  the 
  radial 
  artery 
  at 
  the 
  wrist. 
  

  

  M 
  2 
  

  

  