﻿198 
  

  

  Surgeon-Major 
  F. 
  de 
  Chaumont 
  on 
  the 
  

  

  [Jan. 
  28, 
  

  

  rate 
  orders, 
  and 
  consider 
  them 
  in 
  combination, 
  when 
  we 
  shall 
  have 
  the 
  

   following 
  relative 
  values 
  : 
  — 
  

  

  From 
  From 
  probable 
  

  

  No. 
  Mean 
  Error. 
  Error 
  of 
  Eesult. 
  

  

  1 
  1000 
  . 
  1000 
  

  

  2 
  108 
  197 
  

  

  3 
  38 
  172 
  

  

  4&5 
  38 
  ...... 
  121 
  

  

  and 
  the 
  mean 
  of 
  the 
  two 
  values 
  will 
  be 
  : 
  — 
  

  

  No. 
  1 
  1000 
  No. 
  3 
  108 
  

  

  No. 
  2 
  153 
  Nos.4&5.... 
  80 
  

  

  We 
  have 
  now 
  a 
  series 
  of 
  ratios 
  which 
  follow 
  a 
  regularly 
  descending 
  

   scale, 
  very 
  much 
  in 
  the 
  order 
  we 
  might 
  have 
  expected 
  a 
  priori, 
  seeing 
  

   that 
  the 
  sense 
  of 
  smell 
  is 
  naturally 
  less 
  acute 
  as 
  the 
  organic 
  matter 
  

   increases 
  in 
  amount. 
  But 
  it 
  is 
  of 
  less 
  consequence 
  to 
  determine 
  the 
  

   position 
  of 
  the 
  higher 
  orders 
  in 
  the 
  scale, 
  except 
  as 
  a 
  measure 
  of 
  the 
  

   general 
  value 
  of 
  the 
  observations 
  throughout 
  the 
  inquiry, 
  the 
  really 
  

   important 
  point 
  being 
  the 
  very 
  great 
  superiority 
  of 
  the 
  first 
  order, 
  parti- 
  

   cularly 
  as 
  regards 
  the 
  carbonic 
  acid. 
  This 
  is 
  an 
  additional 
  argument 
  for 
  

   its 
  adoption 
  as 
  the 
  limit 
  of 
  admissible 
  impurity 
  in 
  good 
  ventilation. 
  

  

  The 
  amount 
  of 
  fresh 
  air 
  necessary 
  to 
  keep 
  the 
  impurity 
  down 
  to 
  the 
  

   particular 
  limit 
  would 
  be 
  according 
  to 
  the 
  following 
  formula, 
  

  

  P 
  

  

  where 
  d 
  is 
  the 
  delivery 
  of 
  fresh 
  air 
  in 
  cubic 
  feet 
  per 
  head 
  per 
  hour, 
  e 
  the 
  

   amount 
  of 
  carbonic 
  acid 
  expired 
  per 
  hour 
  by 
  one 
  inmate, 
  and 
  p 
  the 
  limit 
  

   of 
  respiratory 
  impurity 
  taken 
  as 
  carbonic 
  acid 
  per 
  cubic 
  foot. 
  If 
  we 
  take 
  

   e 
  to 
  be 
  0-6 
  of 
  a 
  cubic 
  foot 
  in 
  a 
  state 
  of 
  complete 
  repose, 
  such 
  as 
  during 
  

   sleep, 
  we 
  are 
  rather 
  under 
  Pettenkofer's 
  estimate, 
  but 
  considerably 
  

   above 
  Angus 
  Smith's. 
  The 
  following 
  Table 
  gives 
  the 
  amounts 
  necessary 
  

   for 
  the 
  three 
  estimates 
  : 
  — 
  

  

  No. 
  of 
  order. 
  

  

  Limit 
  of 
  

   respiratory 
  

   impurity 
  

   per 
  cubic 
  foot. 
  

  

  Cubic 
  feet 
  of 
  air 
  per 
  head 
  per 
  hour 
  calculated 
  

   from 
  

  

  Angus 
  Smith's 
  

   estimate, 
  

   e= 
  0-450 
  

  

  Proposed 
  esti- 
  

   mate 
  as 
  adopted 
  

   by 
  Dr. 
  Partes, 
  

   e= 
  0600. 
  

  

  Pettenkofer's 
  

   estimate, 
  

   e=0-705. 
  

  

  1. 
  

  

  00001831 
  

  

  2460 
  

  

  3280 
  

  

  3850 
  

  

  2. 
  

  

  0-0003894 
  

  

  1155 
  

  

  1540 
  

  

  1810 
  

  

  3. 
  

  

  00006322 
  

  

  710 
  

  

  950 
  

  

  1115 
  

  

  4&5. 
  

  

  0008533 
  

  

  530 
  

  

  700 
  

  

  825 
  

  

  