﻿404 
  Mr. 
  L. 
  Vegard 
  : 
  Researches 
  upon 
  

  

  about 
  10-15 
  minutes. 
  Near 
  the 
  reversion-point 
  the 
  time 
  

   used 
  was 
  longer 
  — 
  sometimes 
  more 
  than 
  one 
  hour. 
  

  

  The 
  results 
  are 
  given 
  in 
  the 
  following 
  table. 
  The 
  observa- 
  

   tions 
  will 
  be 
  given 
  in 
  the 
  order 
  in 
  which 
  they 
  are 
  observed. 
  

  

  Fig. 
  11. 
  Curve 
  I. 
  

  

  March 
  5. 
  

  

  March 
  6. 
  

  

  7T. 
  

  

  X'. 
  

  

  7T. 
  

  

  X'. 
  

  

  atm. 
  

  

  050 
  

  

  2-68 
  

  

  5-19 
  

  

  8-14 
  

  

  17-79 
  

  

  21-69 
  

  

  31-30 
  

  

  39-72 
  

  

  48-60 
  

  

  57-18 
  

  

  62-88 
  

  

  70-28 
  

  

  mm./hours. 
  

   -318 
  

   -263 
  

   -234 
  

   -213 
  

   -144 
  

   -114 
  

  

  - 
  90 
  

  

  - 
  63 
  

  

  - 
  35-2 
  

  

  - 
  14-2 
  

  

  - 
  2-2 
  

   + 
  15-4 
  

  

  atm. 
  

   73 
  89 
  

   79-91 
  

   82-69 
  

   83-95 
  

   86-58 
  

   89-80 
  

   92-6 
  

   96-4 
  

   100-7 
  

   105-2 
  

   110-1 
  

   78-4 
  

  

  mm./hours. 
  

   + 
  40 
  

   + 
  84 
  

   + 
  112 
  

   + 
  130 
  

   + 
  130 
  

   + 
  128 
  

   + 
  127 
  

   + 
  140 
  

   + 
  149 
  

   +165 
  

   + 
  172 
  

   + 
  72 
  ' 
  

  

  The 
  apparatus 
  was 
  taken 
  down 
  on 
  March 
  7. 
  The 
  testing 
  

   o£ 
  solution 
  gave 
  no 
  detectable 
  change 
  in 
  rotation. 
  It 
  must 
  

   be 
  remembered 
  that 
  the 
  apparatus 
  during 
  the 
  nights 
  had 
  

   been 
  placed 
  under 
  the 
  reversion 
  pressure. 
  The 
  water 
  in 
  the 
  

   cell 
  gave 
  as 
  the 
  mean 
  o£ 
  a 
  number 
  of 
  observations 
  the 
  

   polarization 
  angle 
  — 
  1', 
  which 
  means 
  that 
  no 
  change 
  can 
  be 
  

   detected. 
  As 
  the 
  reversion 
  pressure 
  we 
  get 
  

  

  7r 
  ' 
  = 
  63*8 
  atm. 
  

  

  Experiment 
  II. 
  

  

  The 
  solution 
  contained 
  320 
  gr. 
  cane-sugar 
  in 
  the 
  litre 
  at 
  

   14 
  0, 
  2. 
  Resistance 
  of 
  the 
  membrane 
  275,000 
  ohms 
  at 
  1°*5. 
  

  

  The 
  apparatus 
  was 
  put 
  up 
  in 
  the 
  morning 
  on 
  March 
  18. 
  

   During 
  the 
  day 
  velocities 
  were 
  measured 
  corresponding 
  to 
  

   values 
  of 
  ir 
  from 
  to 
  75 
  atm. 
  

  

  The 
  following 
  day 
  was 
  devoted 
  to 
  the 
  determination 
  of 
  

   the 
  temperature 
  effect. 
  At 
  first 
  the 
  turning 
  point 
  was 
  

   determined 
  at 
  the 
  temperature 
  11°* 
  3 
  by 
  measuring 
  as 
  

   accurately 
  as 
  possible 
  the 
  rate 
  of 
  flow 
  near 
  this 
  point. 
  Then 
  

   the 
  temperature 
  was 
  lowered 
  to 
  0° 
  by 
  putting 
  the 
  apparatus 
  

   into 
  a 
  vessel 
  filled 
  with 
  ice 
  crushed 
  into 
  small 
  pieces 
  and 
  

  

  