﻿1875.] 
  

  

  On 
  the 
  Theory 
  of 
  Ventilation. 
  

  

  187 
  

  

  vidual 
  element 
  bend 
  in 
  one 
  direction 
  until 
  they 
  join, 
  and 
  the 
  substance 
  of 
  

   the 
  ring 
  thus 
  formed 
  undergoes 
  in 
  both 
  a 
  similar 
  and 
  peculiar 
  process 
  

   of 
  disintegration. 
  Trom 
  these 
  facts 
  the 
  author 
  infers 
  that 
  the 
  rods 
  

   and 
  cones 
  of 
  the 
  retina 
  are 
  composed 
  of 
  fibrillary 
  tissue 
  in 
  its 
  simplest 
  

   form. 
  

  

  12. 
  Transverse 
  sections 
  of 
  muscular 
  fibre, 
  when 
  examined 
  at 
  intervals, 
  

   show 
  varying 
  appearances, 
  only 
  a 
  small 
  minority 
  of 
  such 
  preparations 
  

   being 
  successful. 
  Successful 
  preparations 
  show 
  one 
  or 
  more 
  of 
  three 
  

   appearances 
  : 
  — 
  (a) 
  primary 
  bundles, 
  corresponding 
  to 
  Cohnheim's 
  fields 
  ; 
  

   (b) 
  groups 
  of 
  these 
  (secondary 
  bundles), 
  the 
  aggregate 
  of 
  which 
  fill 
  up 
  

   the 
  space 
  bounded 
  by 
  the 
  sarcolemma 
  ; 
  (c) 
  a 
  threadwork 
  of 
  fine 
  fibres 
  

   surrounding 
  the 
  primary 
  bundles, 
  in 
  meshes. 
  

  

  13. 
  Examination 
  of 
  connective 
  tissue, 
  in 
  various 
  stages 
  of 
  inflamma- 
  

   tion, 
  yields 
  strongly 
  confirmatory 
  evidence 
  in 
  favour 
  of 
  the 
  interpretation 
  

   given 
  by 
  the 
  author 
  to 
  the 
  appearances 
  above 
  described. 
  

  

  January 
  28, 
  1875. 
  

  

  JOSEPH 
  DALTON 
  HOOKER, 
  C.B., 
  President, 
  in 
  the 
  Chair. 
  

  

  The 
  Presents 
  received 
  were 
  laid 
  on 
  the 
  table, 
  and 
  thanks 
  ordered 
  for 
  

   them. 
  

  

  The 
  following 
  Papers 
  were 
  read 
  : 
  — 
  

  

  I. 
  a 
  On 
  the 
  Theory 
  of 
  Ventilation 
  : 
  an 
  attempt 
  to 
  establish 
  a 
  

   positive 
  basis 
  for 
  the 
  calculation 
  of 
  the 
  amount 
  of 
  Fresh 
  Air 
  

   required 
  for 
  an 
  Inhabited 
  Air-space." 
  By 
  Surgeon-Major 
  F. 
  

   de 
  Chaumont, 
  M.D., 
  Assistant 
  Professor 
  of 
  Hygiene, 
  Army 
  

   Medical 
  School. 
  Communicated 
  by 
  Prof. 
  Parkes, 
  M.D., 
  

   F.R.S. 
  Received 
  November 
  18, 
  1874. 
  

  

  The 
  question 
  of 
  ventilation, 
  and 
  the 
  amount 
  of 
  fresh 
  air 
  required 
  to 
  

   keep 
  an 
  inhabited 
  air-space 
  in 
  a 
  sweet 
  and 
  healthy 
  condition, 
  has 
  been 
  

   much 
  discussed 
  of 
  late 
  years, 
  and 
  very 
  fully 
  treated 
  of 
  by 
  various 
  writers 
  ; 
  

   but 
  there 
  was 
  a 
  good 
  deal 
  of 
  vagueness 
  and 
  want 
  of 
  precision 
  in 
  the 
  

   manner 
  of 
  treatment 
  previous 
  to 
  the 
  Report 
  of 
  the 
  Committee 
  on 
  Metro- 
  

   politan 
  Workhouse 
  Infirmaries 
  in 
  1867. 
  In 
  a 
  paper 
  in 
  the 
  ' 
  Lancet' 
  in 
  

   1866 
  1 
  attempted 
  to 
  show 
  that 
  a 
  more 
  scientific 
  method 
  might 
  be 
  employed, 
  

   and 
  suggested 
  some 
  f 
  ormulaB, 
  which 
  were 
  quoted 
  by 
  Dr. 
  Parkes 
  in 
  a 
  paper 
  

   appended 
  to 
  the 
  Report 
  above 
  mentioned. 
  Professor 
  Donkin 
  also 
  inves- 
  

   tigated 
  the 
  question 
  there, 
  and 
  in 
  a 
  short 
  but 
  exhaustive 
  paper 
  showed 
  

  

  