﻿of Light by small Particles. 



V«« + * 8 «r 2 + 



Accordingly 



rfa? 



{^•§)+^} 



n dz\dz dz J 



449 



(4) 



1 ^TrnJlJ r dx dy\ dz J av ' 



47raJJJ dz dx dy\ r J ' 



47n? 'JJJ dx dydz\ r ) V ' 

 AnT rff y* d* /e- ikr \ 

 Amn dx r 2 dr 2 \ r J' 



higher powers of - being neglected. By similar reasoning, 

 -TAD *, d fe-^\ 



T^And^ xy d^_ fe^\ 

 47r n dx r 2 dr 2 \ r )' 

 T AD w x d (6~^\ 

 ™*-ln-W k ^r-~dr~\~) 

 _T An d£ x 2 d* (e- ikr \ 

 47r n dx r 2 dr 2 \ r J 



4-7T n dx r 



or, since 





*&. 



ik s T e~ i} 

 4m r 



dx 

 An yz 



ike ihx , 



\ n r*)' 



i^T e- ikr /AJ) y 



V 1) r n 



^o = 



47T r 



47T 



An xy\ 



(5) 



/ AU X 



\ D~7 



+ 



Aw z^—x^ 



