( 44^ ) 
as is mod evident : and from undoubted Arguments its 
proved, that there is fuch a Gravitation towards the 
Centre of the Sun, Moon, and all the Planets. 
From this Principle, as a neceffary Confequence, fol- 
lows the Sphaerical Figure of the Eirthand Sea, and of 
aJl the other C^leftial Bodies : and tho' the tenacity 
and firmnefs of the Solid Parts, fupport the Inequalities 
of the Land above the Level 3 yet the Fluids, pre/ling 
equally and eafily yielding to each other, (bon reftore 
the /£quilihriuM, if difturbed, and maintain the exad: 
Figure of the Globe. 
Now this force of Defcent of Bodies towards theCen- 
ter, is not in ail places alike, but is ftill iefs and lefi, as 
the diftance of the Center encreafes : and in this Book 
itisdemonftratedjthat this Force decreafcs as the Square 
of the diftance increafes; that is, i^e weight of Bodies 
and the force of their Fall is Iefs, in parts more remo- 
ved from the Center^ in the proportion of the Squares 
of the Diftance, So as for Example, a Ton weight on 
the Surface of the Earth, if it were raifed to the 
height of 4000 Miles, which I fuppofe the femidiami- 1 
ter of the Earth, would weigh hut :J of a Ton, or 5 | 
Hundred weight : if to iiaoo Miles, or 3 femidiame- i 
ters from the Surface, that is 4 from the Center, it I 
would weigh but \^ part of the Weight on the Surface, f 
or a Hundred and Quarter: So that it would be as eafie i 
for the Strength of a Man at that height to carry a 1 
Ton weight, as here on the Surface a igol And in i 
the fama Proportion does the. Velocities of the fall of | 
Bodies decreafe : For whereas on the Surface of the I 
Earth all things fall 16 Foot in afecond, at one femidi- I 
ameter abov^ this Fall is but 4 Foot ; and at 3 femidia- | 
meters, or 4 from the Centre, it is but w of the FaH I 
at the Surface, or but one Foot in a fecond : And at | 
greater Diftances both Weight and Fall become very ' 
fmaU, 
