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128 Diminution at the remotet Ditance from the Center of the Earth, or on the Summits of the highet Mountains; Why, aid Sir Iaac, may not this Power extend as high as the Moon? And in Cae, its Influence reaches o far, is it not very probable that this Power retains it in its Orbit, and determines its Motion? But in cae the Moon obeys this Principle (whatever it be) may we not conclude very naturally, that the ret of the Planets are equally ubject to it? In cae this Power exits (which beides is prov'd) it mut increae in an invere Ratio of the Squares of the Ditances. All therefore that remains is, to examine how far a heavy Body, which hould fall upon the Earth from a moderate height, would go; and how far in the ame Time, a Body which hould fall from the Orbit of the Moon, would decend. To find this, nothing is wanted but the Meaure of the Earth, and the Ditance of the Moon from it.

Sir Iaac Newton reaon'd. But at that Time the Englih had but a very