Dispersion in Relation to the Electron Theory. 253 



The values of n are deduced from the observations of Simon *. 

 t = 20°. 



Obs. 



xxio*. 



£xio 6 . 



W 20- 



0XlO u . 



a 



•6708 



1764 



1-6475 



7-858 



b 



•5893 



23-83 



1-6576 



8-283 



c 



•4958 



3821 



1-6783 



9 370 



d 



•4529 



50-19 



1-6942 



10296 



e 



•4046 



7436 



1-7231 



12-17 



./' 



•3735 



105-4 



1-7531 



14-70 



The values of \ x deduced from equation (9) are progressive. 



ac = -2054 



bd = 



df 



•2120 

 '2198 



•2298 



ad = '2087 

 be = -2166 

 cf= '226S 



The exceptionally high value of \ x combined with the 

 high density (1*487) of the liquid accounts for the very 

 large magnetic rotation produced. 



Proceeding to estimate the value of the larger dispersional 

 period from equation (10) we obtain : — 

 from ace, X x = '2532, 

 bdf, Xi = '2563. 



The latter value gives k l — 3*1286, k 2 = 3*5245 ; and the 

 former gives h x = 3*2151, k 2 = 3*4858. 



Taking the value obtained from the larger rotations as the 

 more accurate, we have 



»x 10" = 3-1286 ( v Jp 6569 y + 3-5245. 



xxio 4 . 



(obs.). 



<p (calc). 



Diff. 



•6708 



7-858 



7-814 



-•044 



•5893 



8-283 



8-283 



•000 



•4958 



9370 



9-351 



-019 



•4529 



10-296 



10295 



-001 



•4046 



12-17 



12-25 



+ •08 



•3735 



mo 



14-70 



•00 



* Loc. cit. 



