﻿Circulation 
  of 
  the 
  Blood. 
  

  

  149 
  

  

  Results 
  arrived 
  at 
  from 
  the 
  study 
  of 
  the 
  simultaneous 
  ivrist 
  and 
  

   ankle 
  tracings. 
  

  

  In 
  employing 
  the 
  tracings 
  obtained 
  from 
  the 
  above 
  compound 
  instru- 
  

   ment, 
  two 
  objects 
  were 
  kept 
  in 
  view 
  — 
  -first, 
  to 
  find 
  the 
  interval 
  between 
  

   the 
  commencement 
  of 
  the 
  primary 
  rises 
  in 
  the 
  wrist 
  and 
  ankle 
  curves 
  ; 
  

   and 
  secondly, 
  to 
  observe 
  whether 
  or 
  no 
  the 
  superposition 
  of 
  the 
  one 
  trace 
  

   upon 
  the 
  other 
  verified 
  or 
  falsified 
  the 
  statement 
  made 
  in 
  Prop. 
  III., 
  

   that 
  the 
  lengths 
  of 
  the 
  different 
  parts 
  of 
  each 
  element 
  of 
  the 
  curve 
  were 
  

   the 
  same 
  in 
  the 
  two 
  arteries. 
  

  

  The 
  following 
  Table 
  contains 
  the 
  measurements 
  of 
  the 
  lengths 
  of 
  the 
  

   intervals 
  between 
  the 
  commencement 
  of 
  the 
  primary 
  rise 
  in 
  the 
  wrist 
  and 
  

   ankle 
  tracings 
  at 
  different 
  rapidities 
  of 
  pulse, 
  from 
  which 
  it 
  is 
  clear 
  that 
  

   this 
  interval 
  varies 
  very 
  slightly 
  within 
  the 
  range 
  that 
  can 
  be 
  obtained, 
  

   and 
  that 
  the 
  tendency 
  is 
  for 
  it 
  to 
  be 
  very 
  slightly 
  longer 
  in 
  the 
  slower 
  

   pulses. 
  

  

  Eapidity 
  of 
  

   pulse. 
  

  

  Length 
  of 
  interval 
  between 
  commencement 
  of 
  systolic 
  rise 
  

   at 
  the 
  wrist 
  and 
  at 
  the 
  ankle. 
  

  

  62 
  

  

  •00115' 
  

  

  occurring 
  14-08 
  times 
  in 
  each 
  beat. 
  

  

  63 
  

  

  •00125' 
  

  

  12*7 
  

  

  55 
  55 
  55 
  

  

  67 
  

  

  •001343' 
  

  

  11-11 
  

  

  55 
  55 
  55 
  

  

  

  •0013278' 
  

  

  11-24 
  

  

  5 
  5 
  5 
  5 
  5 
  5 
  

  

  70 
  

  

  •001222' 
  

  

  H-7 
  

  

  55 
  55 
  55 
  

  

  71 
  

  

  •00136' 
  

  

  10-2 
  

  

  55 
  55 
  55 
  

  

  

  •00124' 
  

  

  11-41 
  

  

  55 
  ?J 
  )> 
  

  

  

  •0013' 
  

  

  10-8 
  

  

  55 
  55 
  55 
  

  

  72 
  

  

  •0012' 
  

  

  11*7 
  

  

  55 
  55 
  ?5 
  

  

  55 
  

  

  •001206' 
  

  

  11-52 
  

  

  55 
  55 
  55 
  

  

  79 
  

  

  •001145' 
  

  

  11-06 
  

  

  55 
  55 
  55 
  

  

  80 
  

  

  •00126' 
  

  

  9-96 
  

  

  55 
  55 
  5? 
  

  

  81 
  

  

  •001233' 
  

  

  10-37 
  

  

  15 
  5 
  5 
  5 
  5 
  

  

  82 
  

  

  •001123' 
  

  

  10-86 
  

  

  55 
  55 
  55 
  

  

  ?> 
  

  

  •00122' 
  

  

  10 
  

  

  55 
  55 
  55 
  

  

  95 
  

  

  •00122' 
  

  

  8-67 
  

  

  55 
  55 
  55 
  

  

  98 
  

  

  •001085' 
  

  

  9-7 
  

  

  55 
  55 
  >? 
  

  

  99 
  

  

  •00116' 
  

  

  8-607 
  

  

  

  which 
  gives 
  an 
  average 
  length 
  of 
  -0012314 
  of 
  a 
  minute 
  for 
  all 
  the 
  rates. 
  

  

  It 
  being 
  possible 
  to 
  estimate 
  with 
  considerable 
  accuracy 
  the 
  distance 
  

   from 
  the 
  aortic 
  valves 
  of 
  the 
  spots 
  on 
  the 
  arteries 
  at 
  which 
  the 
  instru- 
  

   ment 
  is 
  usually 
  applied, 
  it 
  becomes 
  a 
  point 
  of 
  interest 
  to 
  determine 
  from 
  

   the 
  facts 
  arrived 
  at 
  the 
  rapidity 
  with 
  which 
  the 
  primary 
  undulation 
  

   travels 
  from 
  its 
  origin 
  (the 
  heart) 
  to 
  the 
  peripheral 
  vessels. 
  The 
  radial 
  

   artery 
  at 
  the 
  wrist 
  and 
  the 
  posterior 
  tibial 
  artery 
  at 
  the 
  ankle 
  are, 
  as 
  

   nearly 
  as 
  can 
  be 
  determined, 
  29 
  inches 
  and 
  52| 
  inches 
  respectively 
  from 
  

   the 
  origin 
  of 
  the 
  aorta 
  in 
  myself 
  (on 
  whom 
  all 
  the 
  tracings 
  have 
  been 
  

   taken), 
  as 
  previously 
  mentioned 
  ; 
  and 
  as 
  the 
  time 
  of 
  transit 
  of 
  the 
  wave 
  

  

  VOIi. 
  XXIII. 
  N 
  

  

  