ABSTRACT
Rontgen rays, can be changed from a conductor to an insulator makes the use of these rays a valuable means of studying the conduction of electricity through gases, and the study of the properties of gases when in the state into which they are thrown by the rays promises to lead to results of value in connection with this subject. A very suggestive result is the effect of passing a current of electricity through the gas on its way from the aluminium vessel where it is exposed to the Rontgen rays to the place where its conductivity is examined. The period during which a bulb gives out Rontgen rays at a uniform rate is not a long one, and as most of the experiments required the rate of emission to be constant, they have entailed the use of a very large number of bulbs, all of which have been made by Mr. Everett.
