﻿Forces 
  produced 
  hy 
  Flowing 
  Solutions. 
  595 
  

  

  varied 
  bet\Yeen 
  the 
  limits 
  0*816 
  and 
  0'823 
  mm. 
  The 
  solution 
  

   employed 
  was 
  X/3000 
  KCl. 
  The 
  temperature 
  varied 
  between 
  

   20° 
  and 
  20°' 
  5 
  C. 
  One 
  cm. 
  on 
  the 
  electrometer 
  scale 
  cor- 
  

   responded 
  to 
  0-025 
  volt. 
  The 
  experiment 
  was 
  commenced 
  

  

  at 
  10.32 
  

   before. 
  

  

  A. 
  31. 
  A 
  and 
  B 
  have 
  the 
  same 
  

  

  significance 
  

  

  as 
  

  

  Time. 
  

  

  A. 
  

  

  B. 
  

  

  E.M.F. 
  

  

  E.M.F./B. 
  

  

  A.M. 
  

  

  mm. 
  

  

  mm. 
  

  

  volt. 
  

  

  

  10.34 
  

  

  368-1 
  

  

  189-5 
  

  

  0-288 
  

  

  1-518x10-^ 
  

  

  41 
  

  

  361-5 
  

  

  186-1 
  

  

  0-282 
  

  

  1-514 
  

  

  47 
  

  

  360-5 
  

  

  185-6 
  

  

  0-286 
  

  

  1-544 
  

  

  50 
  

  

  707-9 
  

  

  3'i4-6 
  

  

  0-422 
  

  

  1-158 
  

  

  52 
  

  

  707-5 
  

  

  364-2 
  

  

  0-4-28 
  

  

  1-176 
  

  

  55 
  

  

  203-0 
  

  

  ]04-5 
  

  

  0-144 
  

  

  1-377 
  

  

  58 
  

  

  208-6 
  

  

  107-4 
  

  

  0-159 
  

  

  1-478 
  

  

  59 
  

  

  360-4 
  

  

  185-6 
  

  

  0-270 
  

  

  1-458 
  

  

  11.01 
  

  

  366-1 
  

  

  188-5 
  

  

  0-279 
  

  

  1-480 
  

  

  11 
  

  

  4121 
  

  

  212-2 
  

  

  0-316 
  

  

  1-490 
  

  

  16 
  

  

  422-4 
  

  

  217-4 
  

  

  0-327 
  

  

  1-504 
  

  

  18 
  

  

  178-7 
  

  

  920 
  

  

  0-157 
  

  

  1-703 
  

  

  19 
  

  

  172-1 
  

  

  88-6 
  

  

  0-154 
  

  

  1-737 
  

  

  21 
  

  

  609-8 
  

  

  314-0 
  

  

  0-471 
  

  

  1-500 
  

  

  24 
  

  

  6U21 
  

  

  3100 
  

  

  0-456 
  

  

  1-471 
  

  

  ; 
  26 
  

  

  472-2 
  

  

  243-1 
  

  

  0-352 
  

  

  1-448 
  

  

  ! 
  28 
  

  

  463-3 
  

  

  238-5 
  

  

  0-347 
  

  

  1-454 
  

  

  : 
  38 
  

  

  397-8 
  

  

  204-8 
  

  

  0-300 
  

  

  1-464 
  

  

  39 
  

  

  326-6 
  

  

  204-2 
  

  

  0-297 
  

  

  1-452 
  

  

  If 
  the 
  fioriires 
  are 
  re-arranged 
  according 
  to 
  pressure 
  it 
  is 
  

   seen 
  that 
  for 
  the 
  extreme 
  values 
  there 
  is 
  a 
  certain 
  progression 
  

   varying 
  inversely 
  as 
  the 
  pressure, 
  but 
  between 
  the 
  limits 
  of 
  

   200 
  and 
  600 
  mm. 
  the 
  influence 
  is 
  small, 
  and 
  the 
  simple 
  form 
  

   of 
  the 
  Helmholtz 
  theory 
  seems 
  well 
  supported 
  by 
  the 
  ex- 
  

   periment. 
  The 
  small 
  remaining 
  change 
  within 
  these 
  limits 
  

   seems 
  unavoidable, 
  and 
  must 
  be 
  regarded 
  as 
  due 
  to 
  changes 
  

   in 
  the 
  behaviour 
  of 
  the 
  tube 
  with 
  time. 
  

  

  Experiment 
  3. 
  To 
  ascertain 
  the 
  effect 
  of 
  temperature. 
  — 
  A 
  

   dilute 
  solution 
  of 
  potassium 
  chloride 
  was 
  used 
  as 
  in 
  the 
  

   previous 
  experiment. 
  It 
  v/as 
  heated 
  to 
  a 
  convenient 
  tempe- 
  

   rature 
  before 
  introduction 
  into 
  the 
  glass 
  bottle. 
  There 
  it 
  

   cooled 
  slowly, 
  and 
  measurements 
  v>'ere 
  made 
  during 
  the 
  

   process. 
  A 
  thermometer 
  was 
  placed 
  in 
  the 
  escaping 
  stream 
  

   of 
  liquid. 
  As 
  a 
  conceivable 
  precaution 
  against 
  a 
  larger 
  

   "time-effect^' 
  a 
  very 
  slow 
  stream 
  of 
  liquid 
  was 
  caused 
  to 
  

   flow 
  continuously 
  between 
  the 
  sets 
  of 
  readings. 
  The 
  tube 
  

   used 
  was 
  the 
  same 
  as 
  that 
  in 
  Experiment 
  2. 
  One 
  cm. 
  on 
  the 
  

   electrometer 
  scale 
  corresponded 
  to 
  0'025 
  volt. 
  The 
  experiment 
  

   was 
  commenced 
  at 
  11.10 
  a.m. 
  

  

  