﻿Media 
  Sitbjected 
  to 
  Torsion. 
  

  

  97 
  

  

  rotatory 
  polarization 
  in 
  the 
  opposite 
  direction 
  to 
  tlie 
  twist. 
  

   The 
  observations 
  with 
  tubes 
  3, 
  5, 
  6 
  (except 
  the 
  last 
  experiment), 
  

   12-16, 
  19-23, 
  are 
  entitled 
  to 
  the 
  greater 
  confidence. 
  As 
  is 
  

   remarked 
  above, 
  there 
  is 
  some 
  uncertainty 
  about 
  the 
  readings 
  

   with 
  tubes 
  2, 
  7-9, 
  17 
  and 
  the 
  last 
  observations 
  with 
  6. 
  Tubes 
  

   1, 
  1, 
  10, 
  11, 
  18 
  do 
  not 
  show 
  rotatory 
  polarization 
  in 
  the 
  oppo- 
  

  

  Fiff. 
  2. 
  

  

  Calves-foot 
  Jelly 
  in 
  rubber 
  tubes 
  

  

  Abscissas 
  represent 
  twist 
  per 
  centimeter 
  of 
  leng-th. 
  

  

  Ordinates 
  represent 
  rotation 
  of 
  the 
  plane 
  of 
  polarization 
  per 
  centimeter 
  of 
  length. 
  

  

  Numbers 
  signify 
  number 
  of 
  jelly 
  tube. 
  

  

  site 
  direction 
  to 
  the 
  twist, 
  but 
  these 
  observations 
  were 
  marked 
  

   at 
  the 
  time 
  they 
  were 
  made 
  as 
  very 
  uncertain. 
  The 
  observa- 
  

   tions 
  with 
  the 
  tubes 
  for 
  which 
  the 
  results 
  have 
  no 
  uncertainty, 
  

   and 
  with 
  which 
  readings 
  were 
  made 
  with 
  more 
  than 
  one 
  posi- 
  

   tive 
  or 
  negative 
  twist, 
  are 
  represented 
  graphically 
  in 
  fig. 
  2. 
  It 
  

   was 
  interesting 
  to 
  notice 
  that 
  the 
  jelly 
  behaved 
  as 
  an 
  elastic 
  

   solid 
  and 
  did 
  not 
  flow 
  with 
  time 
  as 
  a 
  semi-fluid. 
  The 
  rotation 
  

   only 
  sliglitly 
  decreased 
  when 
  a 
  severe 
  twist 
  was 
  continued 
  for 
  

   hours, 
  and 
  when 
  the 
  twist 
  was 
  removed 
  it 
  nearly 
  returned 
  to 
  its 
  

  

  