﻿172 
  Dr. 
  A. 
  D. 
  Waller. 
  The 
  Physiological 
  Cost 
  of 
  Muscular 
  

  

  showing 
  that 
  it 
  is 
  necessary 
  to 
  take 
  samples 
  with 
  least 
  possible 
  delay. 
  The 
  

   average 
  discharge 
  for 
  the 
  last 
  three 
  hours 
  of 
  forenoon 
  was 
  13 
  - 
  53 
  : 
  of 
  afternoon 
  

   14-78. 
  

  

  4. 
  The 
  maximum 
  discharge 
  is 
  greater 
  at 
  the 
  end 
  of 
  the 
  afternoon 
  than 
  of 
  

   the 
  forenoon. 
  v 
  

  

  The 
  volume 
  of 
  ventilation 
  and 
  the 
  percentage 
  of 
  CO2 
  were 
  both 
  higher 
  in 
  

   the 
  first 
  sample, 
  taken 
  immediately 
  after 
  the 
  labourer 
  had 
  dropped 
  tools 
  than 
  

   in 
  the 
  second 
  sample, 
  taken 
  after 
  a 
  pause 
  of 
  three 
  minutes. 
  

  

  There 
  is, 
  as 
  may 
  be 
  seen 
  throughout 
  the 
  protocols, 
  a 
  general 
  correspondence 
  

   between 
  volume 
  of 
  ventilation 
  and 
  amount 
  of 
  CO2 
  per 
  second, 
  so 
  that 
  it 
  is 
  

   allowable, 
  with 
  due 
  reservation, 
  to 
  make 
  use 
  of 
  ventilation 
  alone 
  as 
  a 
  guide 
  to 
  

   work 
  done. 
  I 
  have 
  found 
  this 
  guide 
  of 
  value 
  in 
  prolonged 
  observations, 
  and 
  

   when 
  it 
  was 
  not 
  possible 
  to 
  take 
  samples 
  by 
  bag 
  quickly 
  enough 
  to 
  follow 
  the 
  

   change 
  of 
  output 
  of 
  C0 
  2 
  that 
  takes 
  place 
  at 
  the 
  beginning 
  and 
  end 
  of 
  a 
  spell 
  

   of 
  work. 
  For 
  this 
  purpose 
  I 
  have 
  adapted 
  a 
  Verdin 
  spirometer 
  as 
  a 
  litre 
  

   recorder 
  of 
  expired 
  air 
  during 
  rest 
  and 
  during 
  certain 
  kinds 
  of 
  work. 
  The 
  

   results 
  obtainable 
  by 
  this 
  means 
  will 
  be 
  reported 
  upon 
  later. 
  

  

  Labourer 
  No. 
  1. 
  — 
  Thursday, 
  December 
  5, 
  1918. 
  

  

  Time. 
  

  

  Time 
  of 
  

   collection 
  

   in 
  sees. 
  

  

  Litres. 
  

  

  C.c. 
  per 
  

   sec. 
  

  

  C0 
  2 
  per 
  

   cent. 
  

  

  C0 
  2 
  c.c. 
  

   per 
  sec. 
  

  

  Remarks. 
  

  

  7 
  h. 
  30 
  m. 
  

  

  9 
  h. 
  m. 
  

   3 
  m. 
  

  

  10 
  h. 
  m. 
  

  

  3 
  m. 
  

  

  11 
  b. 
  m. 
  

  

  3 
  m. 
  

   11 
  h. 
  45 
  m. 
  

   48 
  m. 
  

  

  11.0m. 
  

  

  2 
  b. 
  m. 
  

  

  3 
  m. 
  

  

  3 
  b. 
  m. 
  

  

  5 
  m. 
  

  

  4 
  h. 
  m. 
  

   4 
  b. 
  3 
  m. 
  

  

  60 
  

  

  40 
  

   60 
  

   42 
  

   60 
  

   40 
  

   60 
  

   40 
  

   60 
  

  

  60 
  

   40 
  

   60 
  

   40 
  

   60 
  

   40 
  

   60 
  

  

  12 
  

  

  22 
  

   23 
  

   21 
  

   18 
  

   22 
  

   17 
  

   23 
  

   19 
  

  

  18 
  

  

  21 
  -5 
  

  

  20 
  

  

  23 
  

  

  19 
  

  

  22 
  

  

  10 
  

  

  200 
  

  

  555 
  

   383 
  

   500 
  

   300 
  

   550 
  

   233 
  

   575 
  

   316 
  

  

  300 
  

   537 
  

   333 
  

   575 
  

   316 
  

   550 
  

   333 
  

  

  2-5 
  

  

  2- 
  8 
  

   17 
  

  

  3- 
  

  

  2- 
  8 
  

  

  3- 
  1 
  

  

  2- 
  9 
  

  

  3- 
  6 
  

   3-0 
  

  

  2- 
  8 
  

  

  3- 
  

  

  2- 
  6 
  

  

  3- 
  5 
  

   3-2 
  

   3-5 
  

   3-0 
  

  

  5- 
  

  

  15-54 
  

  

  6- 
  51 
  

  

  15 
  -00 
  

  

  8- 
  40 
  

   17 
  -05 
  

  

  6-75 
  

   20-70 
  

  

  9- 
  48 
  

  

  8-40 
  

  

  16 
  -11 
  

   8-65 
  

  

  20-12 
  

   10 
  -11 
  

   19 
  -80 
  

   10 
  -00 
  

  

  After 
  i 
  mile 
  walk 
  fol- 
  

   lowed 
  by 
  5 
  min. 
  rest. 
  

  

  | 
  Trowelling 
  and 
  tapping. 
  

  

  \ 
  Moving 
  tools 
  to 
  anotber 
  

   J 
  part 
  of 
  the 
  building. 
  

  

  Moving 
  gravel, 
  etc., 
  

   > 
  and 
  otber 
  building 
  

   materials. 
  

  

  After 
  £ 
  mile 
  fast 
  walk. 
  

  

  [Work 
  ratber 
  beavier 
  

   | 
  tban 
  usual. 
  

  

  j- 
  Trowelling 
  floor. 
  

  

  The 
  time 
  of 
  collection 
  of 
  samples 
  was 
  chosen 
  as 
  one 
  minute 
  when 
  the 
  

   subject 
  was 
  at 
  rest, 
  but 
  when 
  he 
  was 
  at 
  work 
  it 
  was 
  necessary 
  to 
  collect 
  for 
  a 
  

   shorter 
  period 
  ; 
  the 
  beginning 
  and 
  end 
  of 
  each 
  period 
  was 
  made 
  by 
  sharply 
  

   turning 
  the 
  tap 
  at 
  the 
  end 
  of 
  an 
  expiration, 
  as 
  indicated 
  by 
  the 
  valve 
  click. 
  No 
  

   disturbance 
  by 
  reason 
  of 
  this 
  click 
  was 
  experienced 
  by 
  any 
  of 
  the 
  subjects 
  ; 
  it 
  

  

  