TRAVERSED BY CATHODE RAYS. 
67 
These ratios were determined by taking the mean of a number of readings. 
Samples of the results obtained in five different comparisons are given in Tables III., 
IV., V., VI., and VII., the numbers being consecutive readings with each gas in A. 
They represent very well the working of the method. Although the variations were 
considerable, similar ones occurred in both sets of observations in each comparison, and 
as the number of readings taken was very large, any errors were in a great measure 
compensated. 
Table III.—Oxygen and Air. 
Air in both chambers at 
Oxygen in A at 675T millims. 
746 - 7 millims. 
Air in B at 746'7 millims. 
Ionization in A. 
Ionization in B. 
Ionization in A. 
Ionization in B. 
1-09 
TOO 
1-40 
TOO 
1-37 
55 
1-28 
55 
1-54 
1-39 
55 
1-24 
55 
1-20 
55 
1-35 
1-54 
55 
1-25 
1-41 
1-07 
1-20 
55 
1-41 
1-26 
1-54 
1-41 
55 
1-31 
55 
1-33 
55 
1-32 
1-00 
1-34 
TOO 
Table IV.—Nitrogen and Air. 
Air in A at 734'3 millims. 
Nitrogen in A at 757 millims. 
'Air in B at 757 millims. 
Air in B at 757 millims. 
Ionization in A. 
Ionization in B. 
Ionization in A. 
Ionization in B. 
T10 
TOO 
T04 
TOO 
1-02 
55 
1*12 
55 
T21 
T03 
T05 
T34 
1-29 
55 
1-03 
1T0 
55 
T06 
1-18 
55 
T15 
T04 
T12 
T07 
T08 
TOO 
55 
TOG 
55 
Til 
TOO 
1T0 
TOO 
k 2 
