﻿400 
  

  

  Mr. 
  L. 
  Vegard 
  : 
  Researches 
  upon 
  

  

  Unfortunately 
  I 
  had 
  forgotten 
  to 
  fill 
  the 
  rubber 
  tubing 
  on 
  

   the 
  top 
  of 
  the 
  capillary 
  with 
  water, 
  with 
  the 
  result 
  that 
  the 
  

   water 
  in 
  the 
  cell 
  diminished, 
  and 
  on 
  taking 
  down 
  the 
  cell 
  

   only 
  about 
  one 
  drop 
  of 
  water 
  was 
  left 
  on 
  the 
  bottom 
  of 
  the 
  

   cell. 
  Notwithstanding 
  this 
  the 
  apparatus 
  had 
  kept 
  a 
  constant 
  

   pressure 
  for 
  nearly 
  three 
  days. 
  And, 
  as 
  w 
  r 
  ill 
  be 
  seen, 
  this 
  

   pressure 
  must 
  be 
  almost 
  as 
  near 
  to 
  the 
  ideal 
  equilibrium 
  

   pressure 
  as 
  it 
  is 
  possible 
  by 
  these 
  experiments 
  to 
  get 
  it. 
  

  

  This 
  trial 
  may 
  serve 
  as 
  a 
  proof 
  for 
  the 
  good 
  qualities 
  of 
  

   the 
  membrane. 
  For 
  the 
  least 
  leak 
  of 
  solution 
  would 
  have 
  

   been 
  sufficient 
  to 
  give 
  the 
  small 
  quantity 
  of 
  water 
  soaked 
  

   by 
  the 
  inside 
  of 
  the 
  cell 
  a 
  remarkable 
  concentration. 
  And, 
  

   as 
  a 
  matter 
  of 
  fact, 
  the 
  analysis 
  of 
  the 
  water 
  that 
  had 
  been 
  

   allowed 
  for 
  some 
  time 
  to 
  soak 
  the 
  inside 
  of 
  the 
  cell 
  gave 
  

   no 
  detectable 
  rotation. 
  

  

  The 
  osmotic 
  flow 
  r 
  had 
  caused 
  a 
  considerable 
  change 
  in 
  the 
  

   concentration 
  of 
  the 
  solution. 
  The 
  result 
  of 
  analysis 
  is 
  as 
  

   follows 
  : 
  — 
  

  

  a 
  =40° 
  15' 
  

   a 
  = 
  35°47 
  / 
  . 
  

  

  Testing 
  with 
  Fehling's 
  solution 
  gave 
  no 
  inversion. 
  

  

  Experiment 
  3. 
  

  

  Apparatus 
  put 
  up 
  Nov. 
  29, 
  10 
  p.m. 
  

   Resistance 
  of 
  the 
  membrane 
  290,000 
  at 
  0°'9 
  C. 
  

   G 
  = 
  403-48 
  -gr./l. 
  at 
  ll°-2 
  C. 
  

  

  Observations. 
  

  

  Date. 
  

  

  to. 
  

  

  tm> 
  

  

  1 
  

   a. 
  

  

  h 
  m 
  

  

  

  

  

  Dec 
  1, 
  11 
  a.m. 
  

  

  6-88 
  

  

  7-15 
  

  

  410 
  cm. 
  

  

  „ 
  1, 
  6 
  p.m. 
  

  

  6-92 
  

  

  7-30 
  

  

  3-658 
  „ 
  

  

  „ 
  1, 
  11 
  o 
  „ 
  

  

  693 
  

  

  7-31 
  

  

  3-525 
  „ 
  

  

  „ 
  % 
  11 
  o 
  „ 
  

  

  682 
  

  

  7-14 
  

  

  3-400 
  „ 
  

  

  „ 
  2, 
  2 
  30 
  „ 
  

  

  6-87 
  

  

  7-27 
  

  

  3-370 
  „ 
  

  

  „ 
  2, 
  5 
  „ 
  

  

  6-96 
  

  

  7-39 
  

  

  3-352 
  „ 
  

  

  „ 
  3, 
  10 
  a.m. 
  

  

  7-10 
  

  

  749 
  

  

  3355 
  „ 
  

  

  a 
  =53°25' 
  

   a 
  = 
  52°31 
  / 
  . 
  

  

  The 
  water 
  in 
  the 
  cell 
  gave 
  no 
  detectable 
  rotation. 
  

   The 
  results 
  of 
  these 
  measurements 
  are 
  given 
  

   following 
  table 
  : 
  — 
  

  

  m 
  

  

  th« 
  

  

  