[ in 3 
Whence we {hall have NI for the Direction requir’d, 
of the AttrafUon of the Corpufcle N. 
XIII. If we fuppofe p=q=o, that is, if the Splie- 
riod be homogeneous, we fhall have C I — C X ; 
which agrees with what Mr. Stirling has 'found, in 
that curious Difiemtion he has publiih'd in the Tbila- 
fophical Tranfattions, N® 438. 
Part I?. 
The Ufe of the foregoing Problems, in find# 
ing the Figure of Spheroids, which revolve 
about an Axis. 
XIV. Let us now fuppofe, that the foregoing Sphe : 
roid BNEbe, (Fig. f.) which is dill compofcd of 
Beds or Strata of different Dcnfities, revolves about 
its Axis Bb, and that it is now arrived at its- per- 
manent State. It is plain that the Particles of the 
Fluid, which are upon its Surface, muft gravitate ac- 
cording to a Direction perpendicular to the Curvature 
BN Et for without this Condition there could be no 
/Equilibrium. 
We (hall now inquire, whether the Elliptic Figure 
we have aferibed to our Spheroids can have this Pro- 
perty, and to produce this Effeft, what muft be the 
Relation between the Time of Revolution of the 
Spheroid and the Difference of its Axes. 
Let us then put 4 > for the centrifugal Force at 
the Equator, and the centrifugal Force at N will be 
becaufe jPNx«— C x. 
