﻿190 
  Surgeon 
  -Major 
  F. 
  de 
  Chaumont 
  on 
  the 
  [Jan. 
  28, 
  

  

  case 
  the 
  C0 
  2 
  has 
  been 
  corrected 
  for 
  temperature, 
  but 
  not 
  for 
  barometric 
  

   pressure, 
  as 
  in 
  some 
  cases 
  the 
  reading 
  of 
  the 
  barometer 
  was 
  not 
  taken 
  ; 
  

   the 
  difference, 
  however, 
  would 
  not 
  exceed 
  on 
  an 
  average 
  1 
  per 
  cent. 
  The 
  

   vapour 
  aud 
  humidity 
  were 
  calculated 
  from 
  Grlaisher's 
  Tables. 
  

  

  Although 
  the 
  records 
  of 
  sensation 
  are 
  various 
  in 
  terms, 
  I 
  have 
  thought 
  

   that 
  they 
  might 
  be 
  advantageously 
  reduced 
  to 
  five 
  orders 
  or 
  classes, 
  as 
  

   follows 
  : 
  — 
  

  

  No. 
  1. 
  Including 
  such 
  expressions 
  as 
  "fresh," 
  "fair," 
  "not 
  close," 
  

   " 
  no 
  unpleasant 
  smell," 
  &c, 
  indicating 
  a 
  condition 
  giving 
  no 
  appre- 
  

   ciably 
  different 
  sensation 
  from 
  the 
  outer 
  air. 
  

  

  No. 
  2. 
  Including 
  such 
  expressions 
  as 
  " 
  rather 
  close," 
  " 
  a 
  little 
  close," 
  

   " 
  not 
  very 
  foul," 
  " 
  a 
  little 
  smell," 
  &c, 
  indicating 
  the 
  point 
  at 
  

   which 
  organic 
  matter 
  begins 
  to 
  be 
  appreciated 
  by 
  the 
  sense 
  of 
  

   smell. 
  

  

  No. 
  3. 
  " 
  Close," 
  indicating 
  the 
  point 
  at 
  which 
  organic 
  matter 
  begins 
  to 
  

  

  be 
  decidedly 
  disagreeable 
  to 
  the 
  sense 
  of 
  smell. 
  

   No. 
  4. 
  " 
  Very 
  close," 
  " 
  bad," 
  &c, 
  indicating 
  the 
  point 
  at 
  which 
  organic 
  

  

  matter 
  begins 
  to 
  be 
  offensive 
  and 
  oppressive 
  to 
  the 
  senses. 
  

   No. 
  5. 
  " 
  Extremely 
  close," 
  " 
  very 
  bad," 
  &c, 
  indicating 
  the 
  point 
  at 
  

  

  which 
  the 
  maximum 
  point 
  of 
  differentiation 
  by 
  the 
  senses 
  is 
  

  

  reached. 
  

  

  Where 
  there 
  was 
  a 
  slight 
  smell 
  of 
  tobacco 
  no 
  change 
  in 
  the 
  record 
  was 
  

   made 
  ; 
  but 
  where 
  the 
  smell 
  of 
  tobacco 
  was 
  strong, 
  the 
  observation 
  was 
  

   generally 
  referred 
  to 
  the 
  next 
  order, 
  both 
  because 
  the 
  presence 
  of 
  the 
  

   tobacco-smoke 
  indicated 
  slow 
  change 
  of 
  atmosphere, 
  and 
  also 
  because 
  

   the 
  sense 
  of 
  closeness 
  must 
  have 
  been 
  considerable 
  to 
  make 
  itself 
  felt 
  

   along 
  with 
  the 
  tobacco. 
  Hence 
  such 
  a 
  remark 
  as 
  " 
  rather 
  close," 
  which 
  

   properly 
  belongs 
  to 
  No. 
  2, 
  is 
  referred 
  to 
  No. 
  3, 
  " 
  close," 
  if 
  accompanied 
  

   with 
  a 
  strong 
  smell 
  of 
  tobacco. 
  

  

  The 
  total 
  number 
  of 
  observations 
  for 
  the 
  temperature, 
  vapour, 
  and 
  

   humidity 
  in 
  the 
  inhabited 
  spaces 
  amounts 
  to 
  247*, 
  and 
  of 
  carbonic-acid 
  

   analyses 
  to 
  473. 
  Where 
  the 
  latter 
  are 
  in 
  pairs 
  they 
  are 
  linked 
  by 
  a 
  

   bracket. 
  In 
  each 
  case 
  the 
  external 
  and 
  internal 
  observations 
  and 
  their 
  

   differences 
  are 
  given, 
  and 
  the 
  arithmetical 
  means 
  of 
  all 
  are 
  taken. 
  In 
  the 
  

   differences 
  which 
  represent 
  the 
  quantities 
  due 
  to 
  respiratory 
  impurity, 
  

   the 
  mean 
  error, 
  error 
  of 
  mean 
  square, 
  and 
  probable 
  error 
  (both 
  of 
  a 
  single 
  

   measure 
  and 
  of 
  the 
  result) 
  are 
  calculated, 
  and 
  the 
  limits 
  shown 
  between 
  

   which 
  the 
  range 
  would 
  lie 
  in 
  each 
  case. 
  The 
  values 
  are 
  also 
  given 
  as 
  the 
  

   reciprocals 
  of 
  the 
  squares 
  of 
  mean 
  error 
  and 
  of 
  probable 
  error 
  of 
  result, 
  

   and 
  their 
  ratios 
  to 
  No. 
  1 
  as 
  unity. 
  The 
  modulus 
  is 
  also 
  calculated 
  from 
  

   the 
  mean 
  error 
  and 
  error 
  of 
  mean 
  square, 
  and 
  the 
  ratio 
  of 
  the 
  two 
  results 
  

  

  * 
  It 
  has 
  been 
  thought 
  unnecessary 
  to 
  give 
  these 
  in 
  detail 
  as 
  taking 
  up 
  too 
  much 
  

   space, 
  but 
  the 
  means 
  are 
  given 
  at 
  the 
  end 
  of 
  the 
  Table 
  of 
  Carbonic 
  Acid. 
  

  

  