30^ CooTcsey — Corpuscular Bays, etc. 



If the energy of the corpuscular secondary rays is due, as 

 Prof. J. J. Thomson* has suggested, to an explosion of the atom 

 and not directly to the energy in the primary pulse, it is hard 

 to explain why the more penetrating primary rays give rise to 

 corpuscles of higher velocity than the softer rays do; while 

 the intensity of the primary rays makes no difference in their 

 velocity. The author has been unable to explain this variation 

 in velocity with the nature of the primary pulse, but hopes 

 that further experiments, with modifications in the apparatus, 

 may throw more light on the subject of these corpuscular rays. 



It gives me great pleasure to close by expressing my thanks 

 for the valuable advice received from Prof. H. A. Bumstead, 

 at whose suggestion this work was begun. 



Sheffield Scientific School of Yale University, 

 New Haven, July, 1907. 



* Conduction of Electricity through Gases, 2d ed, p. 320. 



