﻿by 
  Collision 
  of 
  Positive 
  and 
  Negative 
  Ions 
  in 
  a 
  Gas. 
  285 
  

   Table 
  IX. 
  — 
  Helium, 
  pressure 
  7 
  mms. 
  

   ■1. 
  

  

  Table 
  X. 
  — 
  Helium, 
  pressure 
  6 
  mms. 
  

  

  d 
  

  

  •1. 
  

  

  ■2. 
  

  

  •3. 
  

  

  •4. 
  

  

  •6. 
  

  

  •7. 
  

  

  

  

  X-305 
  q 
  

  

  1-89 
  

  

  373 
  

  

  

  140 
  i 
  647 
  | 
  226 
  

  

  a 
  = 
  645 
  

  

  

  1-91 
  

  

  3-66 
  

  

  - 
  

  

  140 
  

  

  686 
  

  

  216 
  

  

  /3 
  = 
  0436 
  

  

  X-506 
  q 
  

  

  2-48 
  

  

  6-55 
  

  

  189 
  

  

  82-0 
  

  

  

  

  a 
  =912 
  

  

  2-51 
  

  

  6-55 
  1 
  18-9 
  

  

  82-0 
  

  

  

  

  /3 
  =142 
  /? 
  

  

  

  X-772 
  q 
  

  

  344 
  

  

  102 
  

  

  95-0 
  

  

  

  

  

  a 
  =10-8 
  

  

  3-02 
  

  

  10-6 
  

  

  92o 
  

  

  

  

  

  /3=-360 
  

  

  Table 
  XL— 
  

  

  -Helium, 
  pressure 
  

  

  4 
  mms. 
  

  

  

  1 
  d 
  

  

  1. 
  

  

  •2. 
  , 
  -3. 
  j 
  -4. 
  

  

  •5. 
  j 
  -6. 
  

  

  •7. 
  

  

  1 
  

  

  X-304 
  q 
  

  

  210 
  

  

  3-77 
  6-95 
  

  

  133 
  

  

  25-8 
  53-0 
  

  

  216 
  | 
  

  

  0=5-80 
  

  

  213 
  

  

  3-79 
  

  

  6-84 
  

  

  13-7 
  

  

  25-3 
  51-6 
  

  

  i 
  

  

  216 
  

  

  /3= 
  0740 
  

  

  Table 
  XII.- 
  

  

  -Helium, 
  pi 
  

  

  essure 
  2 
  mms. 
  

  

  

  d 
  

  

  •i. 
  j 
  ■% 
  

  

  •3. 
  

  

  •4. 
  

  

  *5. 
  

  

  •6. 
  

  

  •8. 
  

  

  

  X-304 
  q 
  

  

  1-54 
  

  

  227 
  

  

  3-37 
  

  

  507 
  

  

  7-96 
  

  

  133 
  

  

  68-5 
  

  

  a=370 
  

  

  1-51 
  

  

  2-22 
  

  

  3-28 
  

  

  5-02 
  

  

  793 
  

  

  134 
  

  

  730 
  

  

  /3=-173 
  ' 
  

  

  X-402 
  q 
  

  

  1-60 
  

  

  226 
  

  

  384 
  

  

  6-05 
  

  

  11-5 
  

  

  29-1 
  

  

  

  a 
  =407 
  

  

  1-51 
  

  

  2-33 
  

  

  372 
  

  

  629 
  

  

  1L8 
  

  

  30-4 
  

  

  

  )3=-300 
  

  

  /Q 
  "V 
  

  

  The 
  curves 
  giving 
  the 
  values 
  of 
  _ 
  and 
  in 
  terms 
  of 
  — 
  

  

  P 
  V 
  V 
  

  

  