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of its place, but the two thousindth part os the Radius os this Globe, wereliifficient to bury the Tops of the Highest Hilis under Water.

7. That in all Parts ot the Surface of the Earth, or rathcr in all Pointscquidistant from its Center the Force of Gravity is ncarly Equal ; so that thelength of the Pendulum Vibrating Seconds of Time, is found in all Parts ofthe World to be very near the sime. ’Tis true, at St. Helena, in the Lati-tude of 16 Deg. South, 1 found that the Pendulum of my Clock, whichVibrated Seconds, nceded to be made {horter than it had been in England, bya very Sensible Space (but which at that time I ncglected to observe accu-rately) before it would keep Time ; and since the like Observat ion s havebeen made by the Frcncb Observer s near the Equinoctial: Yet I dare not■affirm, that in mine it procecded from any other Cau(e,than the great Heightof my Place of Obsevvation above the Surface of the Sea, whereby the Gra-Nry being diminifhed, the Length of the Pendulum, Vibrating Seconds, isproportionably shortned.

4. That Gravity does Equally Affeci all Bodies, witliout regard either totheir Matter, Bulk, or Figure ; so that the Impediment of the Medium be-ing removed, the most Compact and most Loose, the Greatest and Smallest,Bodies would Desoend the sime Spaces in Equal Times ; the truth whcreofwill appear from the Experiment 1 before cited. In thele two last Particu-lars, is {hewn, the great Difference between Gravity and Magnctijm, the oneaftecting only Iron, and that towards its Poles, the other ali Bodies alike inevery part. As a Corollary, from hence it will follow, That there is no stichthing as Positive Levity, those things that appear Light, being only compara-tives so ; and whereas soveral things Riso and Swim in Fluids, ’tis bccausoBulk for Bulk, they are not so Heavy as those Fluids ; nor is there any rea-son, why Cork., for instance, (hould be siid to be Light bccauso It Swims onWater, any more than Iron, bccauso it Swims 0:1 Mercury.

5. That this Power Increases as you Descend, and Decrcases as you Afiendfrom the Center, and that in the. proportion of the Squares cf the Diflancestherefrom Pcciprccally, so as at a double Distance.to have but a qusrter ofthe Force : This Propercy is the Principle on which Mr. Newton has madeout ali the Phaenomena of the Celestial Motions, so easily and naturally, thatits Truth is past dispute. Besides that, it is highly Rational, that the At-traBive or Gravitating Power fhould exert it solf more vigoroudy in a SmallSphere, and weaker in a Greater, in proportion as it is Contracted or Ex-panded j and if so, seeing that the Surfaces of Spheres are as the Squares oftheir Badii, this Power at soveral Distances will be as the Squares of thoseDistances Beciprocally, and then its whole Action upon each Spherical Sur-face, be it great or small, will be always Equal. And this is evidently theRule of Gravitation towards the Centers of the Sun, Jupiter, Satum , and theEarth, and then ce is reasonably inferred, to be the General Principle observedby Nature in ali the rest os the Celestial Bodies.

These are the Principal Affections of Gravity, from which the Rules of thePali of Bodies, and the Motion of ProjeBs, are Mathcmatically deducible,Ms- Ist Newton hath shewed how to desine the Spaces . os the Descent os ?.

Bcdy,