610 Mr. A. 8. Eve on the Ionization produced in 
Fig. 3.—Intensity Curves for Primary Colours (Circular Source 26=382’). 
- 
e Re 
----------- curve (A) represents value of ]-O0F ( 
i: for \=6302 x 10-8 em. r=0:025 em. 
r\% 
~------7--- curve (B) Ms " 1°62F (“) . Reoelt oe a 
r\} 
—_——_— curve (C) e lay 1‘60F (5) a IN==46Bo. Se ~ 
a curve (I) ‘3 total intensity. 
LX. A Comparison of the Ionization produced in Gases by 
penetrating Réntgen and Radium Rays. By A. 8. Eve, 
M.A., Lecturer in Mathematics at MeGill University, 
Montreal *. 
eee is gradually accumulating in favour of the 
view that the y rays and Roéntgen rays are identical in 
their nature. The case has been fully considered by 
Rutherford in ‘ Radioactivity, pp. 141-146. The chief 
objection to the theory consisted in the wide divergence of 
the effects produced by the respective rays when ionizing 
various gases and vapours. The three types of rays from 
radium all produce ionization currents proportional to the 
densities of the gases through which the rays pass. The 
Réntgen rays have been found to diverge widely from this 
law. 7 
The following table will furnish an example; it is an 
extract from a paper by Strutt, Proc. Roy. Soc. 5th Aug. 
1903 :— 
* Communicated by Prof. Rutherford, FBS. 
