44 



THE THEORY OF IONIZATION OF GASES 



TABLE XIV. 



HYDROGEN. p=2 mms. ; X=262 volts per cm. ; 

 a=3-7; /8=-041. 



TABLE XV. 



HYDROGEN. $=4: mms.; X=525 volts per cm.; 

 =7'4; 0=-082. 



Several experiments of this kind have been made with 

 a number of gases, and they all show that when X and p 

 are multiplied by a factor the values of both a and /3 

 are multiplied by the same factor. This agrees with 

 the theory which requires that the connection between fi 

 and the variables X and p should be of the same form 



as the relation 



ion -=/(-), 



p J \p/ 



so that =zd>-. The values 

 p \p/ 



of ^8 may therefore be obtained from a curve whose 

 ordinates are p/p and X/p. 



A point to be noticed is that with a given potential 



