Diminution at the remoteſt Diſtance from the Center of the Earth, or on the Summits of the higheſt Mountains; Why, ſaid Sir Iſaac, may not this Power extend as high as the Moon? And in Caſe, its Influence reaches ſo far, is it not very probable that this Power retains it in its Orbit, and determines its Motion? But in caſe the Moon obeys this Principle (whatever it be) may we not conclude very naturally, that the reſt of the Planets are equally ſubject to it? In caſe this Power exiſts (which beſides is prov'd) it muſt increaſe in an inverſe Ratio of the Squares of the Diſtances. All therefore that remains is, to examine how far a heavy Body, which ſhould fall upon the Earth from a moderate height, would go; and how far in the ſame Time, a Body which ſhould fall from the Orbit of the Moon, would deſcend. To find this, nothing is wanted but the Meaſure of the Earth, and the Diſtance of the Moon from it.
Thus Sir Iſaac Newton reaſon'd. But at that Time the Engliſh had but
