[mclennan-treleaven] residual IONIZATION IN GASES 125 



spontaneous, even in part, but is due to a radiation emitted by 

 the zinc walls of the electrometer which consists of rays of the 

 alpha and beta and possibly of the gamma type. 



(2) The residual ionisation in acetylene has been shewn 

 to be exceptionally high 27 ions per c.c. per second, and evidence 

 has been adduced which goes to shew that this ionisation cannot 

 be wholly due to a radiation of the alpha, beta, or gamma type 

 but that it must to a considerable extent be due either to mole- 

 cular collisions or to a spontaneous disruption of the atoms or 

 molecules which constitute the gas. 



May 1st, 1915. 



The Physical Laboratory, 



University of Toronto. 



9a 



