MOTION OF ELECTKIFIED SYSTEMS OF FINITE EXTENT, ETC. 

 In his latter experiments, which KAUFMANN considers more accurate, we have 



, F J_ _e_ C , , 



"C.HT," 0~H 



where 

 Hence 



/< TT / ' f^ TT ""* ) 



C.Hy C/A H 



= 315xl0 10 , H = 557-1. 



k = -1884V 

 V 



As PLANCK has shown, this gives k greater than 1 for KAUFMANN'S smallest values 

 of z' and y 1 , and I have selected four of his readings from Table VII. as falling within 

 a suitable range. 



We again find that THOMSON'S formula No. 1 gives most satisfactory agreement, 

 while ABEAHAM'S formula and No. 2 do not meet the case. 



z 2 



