EFFECT OF X-RAYS. 



8/> is the pressure difference observed after exhaustion. The ordinates 

 are often merely distributive or show the number of an observation in 

 a series. The fog chambers are wood or glass as specified. 



' I ' 



SO 



120 



jr 



w Jr.KF 5 



VjL 



"^7%^ 



'&io m 



far 



In the above chart the terms tables 2, 5, 6, 7, 8, 9 refer to the tables in test now 



numbered 29, 32, 33, 34, 35, 36. 



45. Dust-free air energized by the X-rays from a distance. In table 

 30 data are given for the case of dust-free air feebly energized by the 

 X-rays, the filter having the same sponge-tube attachment. I was 

 not at the time aware of the rapid decay of the nuclei or ions produced 

 by these means, and about one-half minute was allowed to elapse after 



