64 Prof. D. N. Mallik on a Potential Problem. 
In this case 
where x 2 y 2 z 2 _ 1 
~a* + p + b 2 + iA + 6 r +p~ ; 
where Q = vV + ^)(6 2 +t)(* 2 + ^)- 
We have now to change the order of integration. 
For this, let 
x 2 ti 2 z 2 
_ | 1 | - =1 
a 2 + /uu b 2 + /uu c 2 + /jl 
be a curve in x and p, fju being the abscissa (y and z being 
regarded as constants). 
Then the integral depending on x extends evidently over 
the region included between this curve and a line parallel 
to the /x-axis, i. e. from fi given by 
.■v>2 qjZ ,~2 
~2~i *" if~, *" ~2~, — =1 to A t = QO , 
and from .r = t r 1 to x = x where 
"T 7 2 , .. f „2 i .. ~ X 
xdx 
a 2 -r [A b 2 + fjL c 2 -\-fi 
(with corresponding values of y and z) . 
••• V= -^^1 Q 0?++ + WT^) + <*+* - 1 } 
since j^i 2 + J/i 2 , ~i 2 _-£ 
a 2 H- fi b 2 + fju c 2 -\- fi 
Patna College, Banldpore. 
6th June, 1907. 
