﻿Work 
  Measured 
  by 
  the 
  Discharge 
  of 
  Carbon 
  Dioxide. 
  245 
  

  

  per 
  second, 
  and 
  the 
  working 
  C0 
  2 
  approximately 
  18 
  c.c. 
  (gross), 
  or 
  

   18-3-6 
  = 
  14-4 
  net. 
  

  

  cds 
  

  

  C0 
  2 
  

   per 
  

  

  sec. 
  

   zo 
  

  

  10 
  

  

  3-6 
  

  

  12-2 
  

  

  18-0 
  

  

  18-3 
  

  

  18-8 
  

  

  18-8 
  

  

  3-3 
  

  

  A 
  

  

  16-3 
  

   11-0 
  

  

  3-4 
  

  

  o 
  mm. 
  5 
  

  

  10 
  

  

  1 
  

  

  \ 
  

  

  12-0 
  

  

  26 
  

  

  fe 
  g3-8. 
  5-6 
  

  

  to 
  

  

  Kals. 
  

  

  per 
  

  

  Kout 
  

  

  400 
  

  

  300- 
  

   200- 
  

   100 
  - 
  

  

  15 
  20 
  25 
  30 
  35 
  40 
  45 
  50 
  

  

  Z 
  Kiles 
  

  

  J 
  L 
  

  

  4 
  K.metres 
  

  

  This 
  graph 
  shows 
  further, 
  that 
  the 
  change 
  from 
  resting 
  C0 
  2 
  (3 
  - 
  6) 
  to 
  

   working 
  C0 
  2 
  (18-0) 
  at 
  the 
  outset 
  of 
  work 
  and 
  the 
  return 
  at 
  the 
  end 
  of 
  work 
  

   are 
  complete 
  in 
  about 
  10 
  min. 
  Practically 
  the 
  change 
  may 
  be 
  considered 
  as 
  

   effected 
  in 
  about 
  5 
  min. 
  

  

  The 
  value 
  (gross) 
  of 
  working 
  C0 
  2 
  is 
  given 
  by 
  any 
  one 
  of 
  the 
  last 
  four 
  

   ordinates, 
  or 
  better 
  by 
  their 
  arithmetic 
  mean, 
  18-475. 
  

  

  The 
  gross 
  cost 
  of 
  work 
  = 
  18*475 
  

   The 
  resting 
  C0 
  2 
  = 
  3-6 
  

  

  The 
  net 
  cost 
  of 
  work 
  = 
  14-875 
  

  

  i.e., 
  walking 
  at 
  3£ 
  miles 
  per 
  hour 
  costs 
  A. 
  D. 
  W. 
  nearly 
  15 
  c.c. 
  C0 
  2 
  per 
  

   second, 
  which, 
  if 
  kept 
  up 
  for 
  8 
  hours, 
  must 
  be 
  reckoned 
  as 
  hard 
  work 
  — 
  

   approximately 
  2,400 
  Kals 
  — 
  at 
  300 
  Kals 
  per 
  hour. 
  

  

  The 
  superficial 
  resemblance 
  of 
  this 
  graph 
  to 
  a 
  record 
  of 
  muscular 
  tetanus 
  

   will 
  be 
  obvious 
  to 
  any 
  physiologist 
  ; 
  the 
  record 
  of 
  a 
  wave 
  of 
  C0 
  2 
  passing 
  out 
  

   of 
  the 
  body 
  in 
  consequence 
  of 
  a 
  brief 
  effort 
  will 
  be 
  similarly 
  recognised. 
  

   Objection 
  may 
  be 
  raised 
  to 
  my 
  interpretation 
  of 
  this 
  second 
  record 
  to 
  the 
  

   effect 
  that 
  by 
  reason 
  of 
  the 
  increased 
  pump 
  action 
  — 
  by 
  increased 
  pulmonary 
  

   suction 
  — 
  short 
  samples 
  cannot 
  be 
  trusted 
  as 
  indicating 
  alterations 
  of 
  C0 
  2 
  

   production. 
  With 
  the 
  involuntary 
  deepening 
  of 
  respiration 
  occurring 
  during 
  

  

  