﻿998 Motion of Electrons in Carbon Dioxide. 



In the following table, u is the velocity of agitation of 

 electrons in centimetres per second, I the mean free path 

 of the electron in centimetres, p the pressure of the gas in 

 millimetres of mercury, and X the proportion of energy of 

 the electron lost in collision with a molecule. 



The formulae connecting it, I, and X with the quantities 

 k and W being : — 



u — 1-15 x 10'' x \l\ 



W=- x~x^x0-815, 

 p m u 



W 2 

 Table II. 



Z/p. k. WxM)- 6 . wxlO" 8 . JpxlOO. XxlO 4 . 



50 139 19-5 135-7 367 506 



40 117-5 17-75 124-8 3'84 497 



30 96 159 112-8 415 487 



20 75 13-8 99-5 4-76 472 



10 47 10-8 78-9 5/91 460 



6-5 20-7 7-8 52-4 4'36 543 



5-0 9 5-0 34-5 2-39 516 



4 4-S 32 25-2 1-40 397 

 3 2-3 2-0 17-5 -809 321 

 2 1-8 1-18 15-4 -630 144 



1 1-5 -55 14-1 -538 37'4 



05 1-3 '25 13-1 -454 8-95 

 025 1-2 -12 12-6 -419 2-34 



In order to determine whether or not there were any ions 

 in the stream, the magnetic force was increased, to see if the 

 stream were completely deflected off E x and E 2 *. This was 

 found to be possible when using a magnetic force which was 

 comparatively small and which would not have been sufficient 

 to deflect ions from the plates. Also the quantity k and the 

 velocity W were found to remain constant with different 



values of Z and p when — was constant ; these results show 

 ^ p 



that there could not have been any permanent ions formed 



in the gas. 



* Fig. 1, vol. xlii. p. 875. 



