go 8 Mifcellanea Curtofa. 



Times ; the Truth thereof will appear from 

 the Experiment I before-cited. In thefe two lair, 

 Particulars, is (hewn the great difference be- 

 tween Gravity and Magnetifm, the one affecting 

 only Iron, and that towards its Poles, the other 

 ail Bodies alike in every part. As a Corollary, 

 from hence it will follow, that there is no fuch 

 thing as pcjitive Levity, thofe things that appear 

 light, being only comparatively fo ; and where- 

 as ieveral tilings rife and fwim in Fluids, 'tis be* 

 caufe, Bulk for Bulk, they are not fo heavy as 

 thofe Fluids ; nor is there any Reafon why Cork* 

 for Inft ance, mould be iaid to be light, beeaufe 

 it fwims on Water, any more than Iron, becaufe 

 it fwims on Mercury* 



Fifthly, That this Power incieafes as you de- 

 fcend, and decreafes as you afcend from the Cen- 

 ter, and that in the Proportion of the Squares 

 of the Diftances therefrom reciprocally, fo as at 

 a double Diftance to have but a quarter of the 

 Force j this Property is the Principle on which 

 Mr. Newton has made out all the Phenomena of 

 the Ccelcftial Motions, fo eafily and naturally, 

 that its Truth is pad Difpute. Befides that, 

 it is highly rational, that the attractive or gra- 

 vitating Power mould exert it felf more vigo- 

 rouily m a foall Sphere, and weaker in a grea- 

 ter, in proportion as it is contracted or ex- 

 panded ; and if fo, feeing that the Surfaces of 

 Spheres are as the Squares of their I{adii 9 this 

 Power, at feveral Distances, will be as the 

 Squares of thofe Diftances reciprocally ; and then 

 its whole Action upon each Spherical Surface, 

 be it great or fmall, will be always equal. 

 And this is evidently the Rule of Gravitation 



towards 



