﻿1875.] 
  Stratification 
  in 
  Electrical 
  Discharges 
  in 
  vacuo. 
  361 
  

  

  secondary 
  wire 
  of 
  the 
  coil 
  too 
  feeble 
  to 
  produce 
  any 
  illumination. 
  Pending 
  

   the 
  further 
  develop 
  inent 
  of 
  our 
  investigation, 
  we 
  have 
  ventured 
  to 
  give 
  an 
  

   account 
  of 
  our 
  progress 
  in 
  elucidating 
  some 
  points 
  in 
  the 
  theory 
  of 
  the 
  

   vacuum-discharge, 
  without 
  any 
  wish 
  to 
  ascribe 
  to 
  our 
  results 
  more 
  weight 
  

   than 
  they 
  deserve. 
  

  

  Fig. 
  4, 
  

  

  V 
  2 
  

  

  Batteries 
  of 
  this 
  description 
  may 
  be 
  had 
  from 
  Messrs. 
  Tisley 
  and 
  

   Spiller, 
  Brompton 
  Boad. 
  Their 
  cost, 
  in 
  large 
  numbers, 
  is 
  about 
  one 
  

   shilling 
  per 
  cell, 
  exclusive 
  of 
  the 
  charge 
  of 
  chloride 
  of 
  silver, 
  which 
  costs 
  

   about 
  two 
  shillings 
  per 
  cell. 
  The 
  latter, 
  either 
  in 
  the 
  form 
  of 
  powder 
  

   or 
  of 
  rods 
  cast 
  upon 
  flattened 
  silver 
  wire, 
  may 
  be 
  obtained 
  from 
  Messrs. 
  

   Johnson 
  and 
  Matthey, 
  Hatton 
  Garden. 
  When 
  the 
  battery 
  is 
  exhausted 
  

   the 
  reduced 
  silver 
  may 
  be 
  readily 
  reconverted 
  into 
  chloride, 
  with 
  scarcely 
  

   any 
  loss. 
  

  

  April 
  15, 
  1875. 
  

  

  JOSEPH 
  D 
  ALTON 
  HOOKER, 
  C.B., 
  President, 
  in 
  the 
  Chair. 
  

  

  The 
  Presents 
  received 
  were 
  laid 
  on 
  the 
  table, 
  and 
  thanks 
  ordered 
  for 
  

   them. 
  

  

  The 
  following 
  Papers 
  were 
  read 
  : 
  — 
  

  

  VOL. 
  XXIII. 
  2 
  E 
  

  

  