Sparhing-Potentials  in  Carbon  dioxide  and  Nitrogen.     539 
Pressure  *25  mm. 
d  
•2 
•4 
•6 
•8 
X=525 
a  
2-05 
4-39 
9-82 
25-8 
a  =3-56 
|3=-089 
n  
205 
4-35 
9-77 
26-1 
a  =  1-002.  X«=558.  V=564. 
Pressure  4  nuns. 
d  
•2 
•3 
•4 
•5 
1 
•6 
X-700 
a  
6-41 
16-2 
41 
103 
263 
a  =9-28 
(3  small 
n  =  ead 
6-41 
16-2 
41-2 
104 
262 
Pressure  4  mms. 
d  
•2 
•4 
•6 
•8 
10 
X=350 
a  
1-64 
2-72 
4-41 
7-28 
11*7 
a  =2-47 
/3  small 
n-ead 
1-64 
269 
44! 
7-25 
11-9 
1 
Pressure  2  mms. 
d  
•2 
•4 
•6 
X=700 
q  
9-6 
95 
883 
a  =11-3 
/3  small 
n=*ad 
9-6 
92-5 
881 
The  values  o£  a  here  obtained  for  the  smaller  values  of  — 
P 
agree  very  closely  with  those  obtained  by  Prof.  Town  send 
(Phil.  Mag.  April  1903).  Some  doubt  has  been  expressed 
as  to  the  validity  of  the  experiments  performed  on  carbon 
dioxide,  as  the  gas  is  electrolysed  by  spark-discharge  into 
2N2 
