﻿Ions 
  from 
  Hot 
  Salts. 
  

  

  467 
  

  

  523° 
  C. 
  and 
  a 
  maximum 
  current 
  of 
  8*6 
  x 
  10 
  -n 
  amp. 
  was 
  

   recorded. 
  This 
  maximum 
  was 
  not 
  reached 
  until 
  after 
  30 
  

   minutes, 
  and 
  the 
  subsequent 
  falling 
  off 
  was 
  much 
  less 
  marked 
  

   than 
  before. 
  After 
  leaving 
  in 
  the 
  vacuum 
  cold 
  for 
  2\ 
  hours, 
  

   again 
  practically 
  the 
  same 
  values 
  were 
  obtained 
  except 
  that 
  

   the 
  maximum 
  was 
  reached 
  more 
  slowly 
  and 
  the 
  curve 
  was 
  

   still 
  flatter 
  at 
  the 
  top. 
  The 
  salt 
  was 
  then 
  left 
  cold 
  in 
  dry 
  air 
  

   at 
  atmospheric 
  pressure 
  for 
  20 
  hours. 
  It 
  was 
  then 
  tested 
  at 
  

   523° 
  C. 
  and 
  found 
  to 
  give 
  a 
  maximum 
  current 
  after 
  50 
  

   minutes 
  of 
  as 
  much 
  as 
  2'93 
  x 
  10~ 
  6 
  amp. 
  The 
  variation 
  of 
  

   both 
  currents 
  with 
  time 
  after 
  this 
  treatment 
  is 
  shown 
  in 
  

   fig. 
  6. 
  After 
  leaving 
  cold 
  in 
  the 
  vacuum 
  for 
  14 
  hours 
  

  

  Fie-. 
  6. 
  

  

  60 
  75 
  

  

  //v 
  M/Nures. 
  

  

  currents 
  of 
  about 
  2 
  x 
  .1 
  0~ 
  10 
  amp. 
  were 
  obtained. 
  The 
  experi- 
  

   ment 
  was 
  discontinued 
  at 
  this 
  stage. 
  The 
  proportion 
  of 
  the 
  

   total 
  current 
  which 
  was 
  carried 
  by 
  electrons 
  tended 
  to 
  

   increase 
  continually 
  during 
  the 
  progress 
  of 
  this 
  experiment. 
  

   The 
  proportionate 
  increase 
  was 
  greater 
  for 
  the 
  small 
  currents 
  

   obtained 
  after 
  leaving 
  the 
  cold 
  salt 
  in 
  the 
  vacuum 
  than 
  for 
  

   the 
  large 
  currents 
  obtained 
  after 
  exposing 
  the 
  cold 
  salt 
  to 
  air. 
  

   I 
  do 
  not 
  propose 
  to 
  speculate 
  about 
  the 
  cause 
  of 
  these 
  

   peculiar 
  effects 
  at 
  present. 
  

  

  The 
  negative 
  ionization 
  from 
  the 
  various 
  salts 
  referred 
  to 
  

   below 
  has 
  not 
  been 
  examined 
  so 
  carefully 
  and 
  in 
  so 
  much 
  

   detail 
  as 
  in 
  the 
  case 
  ol 
  calcium 
  iodide. 
  

  

  Strontium 
  Iodide. 
  Srl 
  2 
  . 
  

  

  This 
  salt 
  on 
  first 
  heating 
  gave 
  an 
  emission 
  which 
  was 
  large 
  

   enough 
  to 
  make 
  measurements 
  of 
  e/m 
  with, 
  without 
  any 
  

  

  