548      Mr.  H.  E.  Hurst:  Genesis  of  Ions  by  Collision  and 
Fig.  1 . — Carbon  dioxide. 
550 
^and 
®  V determined  experimentally 
with  ul^.ra,  rieleC  lit, /it. 
x  Theoretictd  value  of XcL. 
- 
!  \ 
\ 
© 
*\. 
© 
s660 
x« 
a  measured  in,  renfimetres 
jo        .  -    mUUmetres  of  Mercury. 
Fig.  2. — Nitrogen. 
\ 
/ 
t        /' 
aett? 
urtfA 
,r..;n 
Ultrt 
a.  ez 
*  lit 
ht. 
* 
i 
/ 
X 
fgrfi 
rst  71 
i  vat 
i  rcqt 
ue  of 
n 
Xd 
i 
+ 
T.itcr 
secon 
'ticat,  yatu 
d  nitrogen. 
i  of  it 
ifer 
y 
/ 

y\ 
/ 
/ 
/ 
/ 
/ 
' 
1 
/ 
/ 
! 
/ 
1 
w 
1    ! 
/ 
:W 
7^ 
3  4- 
a,  measured  in  centimetres 
p         .  millintctres  of  Mercury. 
