I *«* 1 
only frP-pgrq, becaufe we (hall fee afterwards, that 
a Value more compounded, at frP-fgr t i-|-hr s -(-ir t , 
fyc. which by the Property of Series may exprefs all 
Curves, would not produce any Variety in the Cal- 
culation. 
Therefore multiplying the foregoing Equation by 
3+P . ..,5-f-p 
ifrP-fgr^, we (hall have - — Xl +. aa — 
eex^ + p 
3+q 5+q 
4C*fr 
e 4 *5+P 
2 C g X 1 rf-2gtXr 
Acgtgr for the Quantity 
e 4 X5 + q 
"4“ , 
ee X 3 + q 
of Attraction of the Spheroid K L K, exerted upon a 
Corpufcle placed at B. 
III. In this Value making r=e, we fhall have 
3 cfe 1 + P j 8 cfe I+p * ■ 2 C ge 1 + q 8 cge 1+ + 
3 + P 3+P x ? + P 3 + q + 3 +q x 5 +q’ 
which will exprefs the Force of Attraction of the 
Spheroid BEb, exerted upon a Corpufcle placed at 
the Pole B. 
T H E ORE M. 
A Corpufcle being placed in any Toint N of the Sur- 
face of the foregoing Spheroid B E b e, I fay it 
will undergo the fame Attraction from this Sphe- 
roid, as if it were placed at the Tole N of a fe- 
cond Spheroid revolving about the Axe N O, the 
fecond Axe being the Radius of a Circle equal in 
Superficies to the EIRpfis F G ; fuppofing this fe- 
cond Spheroid N G O F (Fig. 3 .) to be compofed of 
the Strata MmqQ_, whofe ‘Denfities are the fame 
as thofe of the Strata KkLIKk, of the firfi 
Spheroid \ 
IV. In 
