﻿Osmosis 
  and 
  Osmotic 
  Pressure. 
  

  

  40" 
  

  

  vations 
  showed 
  a 
  considerable 
  variation 
  in 
  the 
  apparent 
  

   equilibrium 
  point. 
  The 
  equilibrium 
  pressure 
  had 
  increased 
  

   with 
  time. 
  

  

  The 
  apparatus 
  was 
  taken 
  down 
  on 
  March 
  3. 
  The 
  solution 
  

   was 
  somewhat 
  clouded, 
  so 
  the 
  determination 
  of 
  the 
  polariza- 
  

   tion 
  angle 
  was 
  somewhat 
  less 
  accurate. 
  But 
  the 
  change 
  in 
  

   rotation 
  was 
  less 
  than 
  10'. 
  

  

  The 
  increase 
  in 
  pressure 
  cannot 
  be 
  explained 
  by 
  inversion, 
  

   but 
  the 
  cell 
  must 
  have 
  the 
  power 
  to 
  some 
  extent 
  to 
  work 
  

   itself 
  up. 
  

  

  The 
  analysis 
  of 
  water 
  gave 
  a 
  comparatively 
  great 
  

   leak. 
  

  

  6*3 
  cm. 
  3 
  water 
  from 
  the 
  cell 
  -I- 
  18 
  cm. 
  3 
  distilled 
  water 
  gave 
  

   a 
  rotation 
  angle 
  of 
  + 
  13'. 
  The 
  same 
  tube 
  gave 
  for 
  the 
  solution 
  

   used 
  an 
  angle 
  of 
  42° 
  3'. 
  This 
  corresponds 
  to 
  an 
  average 
  

   velocity 
  of 
  2*5 
  mm. 
  /hour. 
  

  

  The 
  results 
  of 
  the 
  measurements 
  are 
  given 
  in 
  the 
  

   tables 
  below 
  and 
  graphically 
  represented 
  by 
  fig. 
  15 
  (PL 
  

   IX.). 
  

  

  Feb. 
  22. 
  

  

  Feb. 
  25. 
  

  

  Feb. 
  27. 
  

  

  Feb. 
  28. 
  

  

  ? 
  =14°-0. 
  

  

  t 
  o 
  =0°. 
  

  

  t 
  =12°-75. 
  

  

  t 
  o 
  =0. 
  

  

  Curve 
  I. 
  

  

  Curve 
  III. 
  

  

  Curve 
  V. 
  

  

  Curve 
  VI. 
  

  

  7T. 
  

  

  V. 
  

  

  7T. 
  

  

  X'. 
  

  

  7T. 
  

  

  V. 
  

  

  atm. 
  

  

  V. 
  

  

  mm./hour. 
  

  

  atm. 
  

  

  ram. 
  hour. 
  

  

  atm. 
  

  

  mm./hour. 
  

  

  atm. 
  

  

  mm./hour. 
  

  

  3160 
  

  

  4-21-5 
  

  

  20-78 
  

  

  -1-3 
  

  

  27-53 
  

  

  4-8-3 
  

  

  2400 
  

  

  -3-7 
  

  

  28-55 
  

  

  4-20-3 
  

  

  21-32 
  

  

  -1-5 
  

  

  25-92 
  

  

  -1-9 
  

  

  25-31 
  

  

  -1-4 
  

  

  27-29 
  

  

  4-17-6 
  

  

  22-65 
  

  

  -0-25 
  

  

  26-15 
  

  

  -0-7 
  

  

  27-25 
  

  

  -f-0-5 
  

  

  24-90 
  

  

  4- 
  6-0 
  

  

  24-42 
  

  

  +012 
  

  

  26-45 
  

  

  4-0-4 
  

  

  28-12 
  

  

  4-4-8 
  

  

  22-28 
  

   20-65 
  

  

  4- 
  0-5 
  

   00 
  

  

  

  

  26-75 
  

  

  27-06 
  

  

  4-3-3 
  

   4-6-9 
  

  

  

  

  i 
  

  

  

  

  

  Feb. 
  26. 
  

  

  27-40 
  

  

  4-8-3 
  

  

  March 
  2. 
  

  

  

  * 
  = 
  12°-5. 
  

  

  

  

  t 
  =Q. 
  

  

  Feb. 
  24. 
  

  

  Curve 
  IV. 
  

  

  

  

  Curve 
  VII. 
  

  

  t 
  =12°'4. 
  

   Curve 
  II. 
  

  

  

  

  

  

  

  

  

  

  

  28-02 
  

   22-00 
  

  

  4-6-2 
  

  

  -7-5 
  

  

  

  

  4061 
  

   29-55 
  

  

  +6-8 
  

   4-35 
  

  

  

  

  23-84 
  

  

  + 
  2-7 
  

  

  23-26 
  

  

  -6-3 
  

  

  

  

  31-51 
  

  

  4-6-6 
  

  

  22-50 
  

  

  -01 
  

  

  24-39 
  

  

  -2-65 
  

  

  

  

  27 
  67 
  

  

  -0-5 
  

  

  23-35 
  

  

  4-0-9 
  

  

  25-57 
  

  

  -1-4 
  ; 
  

  

  

  

  26-38 
  

  

  -22 
  

  

  2142 
  

  

  -33 
  

  

  

  

  

  

  22-91 
  

  

  -7-3 
  

  

  