302 



2, 1908) has already shown that the secondary cathode radi- 

 ations excited by X-rays are not at all symmetrical about 

 the normal plane, the emergence rays being greater than the 

 incidence, as in the case of the y rays. 



It remained, therefore, to examine the secondary X-rays 

 excited by primary X-rays; and the experiments described 



To 



Electro mete s;^=^ 

 « '■■■■- 



#/ii. 



r/c/K 



r/c/A 



r/aw. 



o 





