384 
Mr. Sewell's Demonstration , &c. 
— I — — z z-+-V m ~ 3 Z z -{-, &C. 
V r. z ,n * V n ~ 1 -\-V n ~* Z-\-V‘ ~ Z Z* , &C. 
— mv~ m 
(when v = z] 
which is the same as the expression 
v %m x nv n ~ 1 
' mv m 
be- 
fore derived with only the sign of m changed. The remainder 
of the process being the same as before, shews that the series 
is general, or extends to all cases, regard being had to the 
signs. Q. E. D. 
