84 Mr. Megh Nad Saha on the 



Then we have similarly 



2e 2 



2e 2 



T '=i(JW). Z -=3^(i + ^), 



2e 2 2e 2 



3a 



(«) 



Now we have 



2e 2 r^ 7^ 7\ 7^ ~1 



2. <?. 





Wt + w + T? + M]- 



The second term = from the condition Div a = (X, for 

 this gives 



B fewA B /^ 2 \ 3 tew A 3 / <?w 4 \ 



^ Div W + (^aj + w^ + ^g«3 + ^4« 4 ) = 0, 



from which Div to = 0, 



for the last term is identically zero. 



The X-component of the force on the external space 



2e*<PX d Bl c> ^ B B ,,, 



"— 3Si?' £ ° r ds = W ^v +W ^+ W ^ +Wi W ■ (6) 



We may interpret this force as the reaction of the electron 

 on the external space, which is supposed for purposes of sub- 

 stantiation to be composed of aether. The effective force on 

 the electron is equal and opposite to this force, and has 

 therefore the components 



2e 2 d 2 x 2fcPi 2fcPz 2e^dH 

 3a ds 2 ' 3a d's 2 ' 3a aV ' 3a aV ' 



