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THE 
LONDON, EDINBURGH, ann DUBLIN 
PHILOSOPHICAL MAGAZINE 
AND 
JOURNAL OF SCIENCE. 

[SIXTH SERIES.] © “SS 
FEBRUARY 1904s, Og 
—_ 
XI. The Effect of Temperature on the Toeeaie prasad 
in Gases by the Action of Réntgen Rays*. By ee 
McCuune, A. (McGill), B.A. (Cantab.), Trinity cols 
Cambr idge, “1851 Exhibition Science Scholar” +. 
Introduction. 
URING the course of an investigation on the effect of 
temperature on the rate of recombination of gaseous 
ions, the results of which appeared in a previous paper f, 
some preliminary experiments were made to see what eftect 
the temperature of the gas had upon the amount of ionization 
produced in it. These “preliminary experiments gave results 
which were at variance with some experiments of Prof. Perrin§ 
published in 1897. It was therefore considered advisable to 
make a fresh investigation of this subject. The results of 
this investigation are given in the present paper. 
These experiments were carried out in order to ascertain 
whether a change in the temperature of a gas has any effect 
upon the amount of ionization produced per unit volume by 
the action of Réntgen rays of a given intensity, and if so to 
determine in what way the ionization is affected by the 
temperature. This was tested by the method usually employed 
in testing ionization under different conditions, namely, by 
* A preliminary account of some of these experiments was published 
in the Proceedings of the Cambridge Phil. Soc. vol. xii. pt. 3, 
May 1903. 
+ Communicated by Prof. J. J. Thomson. 
t¢ Phil. Mag. Dec. 1903. 
§ Annales de Chimie et de Physique, xi. p. 496 (1897). 
Phil. Mag. 8. 6. Vol. 7. No. 38. Feb, 1904. G 
