Vol. in, No. 7.] Magnetic Induction in Spheroids. 457 



[N.S.] 

 Also M- ^ ^ ' 



km ( B» - 1) 



[-» 





+ 2 (7« — T Tp" I very nearly. 



Moreover, it can be proved, as is a priori evident, that Oi, O^r 

 &c., are of decreasing magnitudes. 



As a first approximation, therefore, we may reject all but the 

 first term, and we have 



2eh- log (1 + - 



^ (l + 47r^) 2irmt| 1+ ^ 



a» 



37r\ 



{''$) 'J. 



