Recombination  of  Ions  in  Air  and  other  Gases.        483 
2000 
in  the  following  table,  where  P  denotes  the  pressure,  R  the 
range,  and  I  the  ionization  on  an  arbitrary  scale  : — 
Ethyl  Chloride. 
P. 
E. 
I. 
Rxl. 
RxP 
538 
2-87 
1140 
3260 
154 
41-0 
3-78 
860 
3260 
155 
32-5 
4-83 
066 
3220 
157 
22-4 
6-V2 
476 
3300 
155 
75-3 
4-72 
Air. 
546 
2570 
355 
57-2 
6*08 
432 
2620 
352 
46-1) 
7-42 
340 
2520 
348 
38-8 
9-00 
283 
2540 
341) 
