﻿100 
  Ewell 
  — 
  Rotatory 
  Polarization 
  of 
  Light 
  

  

  and 
  the 
  observations 
  with 
  jelly, 
  corroborated 
  in 
  the 
  glass, 
  demon- 
  

   strate 
  that 
  torsion 
  produces 
  rotator}^ 
  polarization, 
  the 
  rotation 
  

   of 
  the 
  phane 
  of 
  polarization 
  being 
  opposite 
  to 
  the 
  twist 
  and 
  a 
  

   function 
  of 
  the 
  twist 
  of 
  degree 
  higher 
  than 
  the 
  first. 
  

  

  In 
  conclusion, 
  I 
  wish 
  to 
  express 
  my 
  thanks 
  to 
  Prof. 
  Wright, 
  

   who 
  suggested 
  the 
  subject 
  and 
  the 
  general 
  method 
  of 
  the 
  work, 
  

   and 
  who 
  afforded 
  me 
  all 
  possible 
  facilities 
  for 
  conducting 
  this 
  

   investigation. 
  

  

  Sloane 
  Physical 
  Laboratory, 
  

  

  Yale 
  University, 
  June 
  22, 
  1899. 
  

  

  