﻿C 
  TLATES 
  OF 
  VOL. 
  XVJIT. 
  SIXTH 
  SERIES. 
  

  

  XXIV.-XXYI. 
  Illustrative 
  of 
  Mi-. 
  T. 
  J, 
  Richmond"? 
  Paper 
  on 
  the 
  

   Formation 
  of 
  Striae 
  in 
  a 
  Dust-Tube 
  by 
  an 
  Electric 
  

   Discharce. 
  

   XXVIl. 
  Illustrative 
  of 
  Messrs. 
  Campbell 
  & 
  Smith"? 
  Paper 
  on 
  

   a 
  Method 
  of 
  Testing 
  Photog-raphic 
  Shutters. 
  

   XXVIII. 
  Illustrative 
  of 
  Mr. 
  A. 
  Campbell's 
  Paper 
  on 
  the 
  

   Measurement 
  of 
  Wave-Length 
  for 
  High 
  Frequency 
  

   Electrical 
  Oscillati 
  ms. 
  

   XXIX. 
  Illustrative 
  of 
  Mr. 
  E. 
  Parr 
  Metcalfe's 
  Paper 
  on 
  Ioni- 
  

   zation 
  in 
  various 
  Gases. 
  

   XXX. 
  Illustrative 
  of 
  Dr. 
  J. 
  P. 
  V. 
  Madseu's 
  Paper 
  on 
  the* 
  

   Scattering 
  of 
  the 
  /3 
  Kays 
  of 
  Radium. 
  

  

  ERRATA. 
  

  

  Page 
  434, 
  third 
  line, 
  delete 
  Mn 
  

   ., 
  436, 
  second 
  line, 
  for 
  x 
  read 
  x 
  

   „ 
  436, 
  second 
  line 
  from 
  bottom, 
  /or 
  reflexion 
  read 
  deflexion. 
  

  

  