( 283 ) 
NB. Here we have fuppos'd no diurnal Revolution , , 
for as foon as that begins , the Centrifugal Force will 
raife the A Equatorial Farts , and change the Sphere 
into a flatted Spheroid \ as has been before Jhewn, and 
is allow'd by Monf Mairan. 
Now ifwe fuppofe the fame Figure of the Earth, but 
the Land (at its firft Creation) as firm as it is now * it 
will in that Cafe follow from Monf. Mairan's Prin- 
ciples, that the Sea muft rife and overflow all the JEqua- 
torial Regions, tho’ the Earth had no diurnal Revolution- 
and much more fo 3 when the Centrifugal Force, ariling 
from the diurnal Motion, helps to carry the Water the 
fame Way. 
DEMONS TR AT ION. 
Let P a P y£ * reprefentthe Plane of a Meridian, P P 
the Axis of the Earth (fuppos’d an oblong Spheroid) 
a JE the Diameter of the ^Equator, d e a a Part of the 
Surface of the Earth, a A and e B two Perpendiculars to 
the Surface of the Earth ( which are here two Rays of 
Curvature)/* the Surface of the Sea, and f deg, baac 
two Cylinders of Sea-Water of equal Bafes and equal 
Heights. 
Since Gravity ads on the two equal Columns of Wa- 
ter b ac a, fdeg in the reciprocal Ratio of the Ray 
of Curvature (at the refpeftive Places of the Columns) 
drawn into that Part of it which Monf. Mairan calls 
the Line of Tendency, (that is, in the Ratio of B x 
e Z to a A x a C) the Weight of/* : will be to the 
Weight of b a : : As a A x a C : to e B x e Z. There- 
fore if there be a Communication between the fluid Co- 
* Fig. hi. 
lumns 
