1. To the first objection of those you mention; _That it appears not how two Bodies, that have no tye, can have one common Center of Gravity:_ that is (for so I understand the intendment of the objection) can act or be acted in the same manner, as if they were connected: I shall onely answer, that it is harder to shew _How_ they have, than _That_ they have it. That the Load-stone and Iron have somewhat equivalent to a Tye; though we see it not, yet by the effects we know. And it would be easy to shew, that two Load-stones, at once applyed, in different positions, to the same Needle, at some convenient distance, will draw it, not to point directly to either of them, but to some point between both; which point is, as to those two, the _common Center of Attraction;_ and it is the same, as if some _one_ Load-stone were in that point. Yet have these two Load stones no connection or tye, though a _Common Center of Virtue_ according to which they joyntly act. And as to the present case, _How_ the Earth and Moon are connected; I will not now undertake to shew (nor is it necessary to my purpose;) but, That there is somewhat, that doth connect them, (as much as what connects the Load-stone, and the Iron, which it draws,) is past doubt to those, who allow them to be carryed about by the Sun, as one Aggregate or Body, whose parts keep a respective position to one another: Like as _Jupiter_ with his _four Satellites_, and _Saturn_ with his _one_. Some Tye there is, that makes those _Satellites_ attend their _Lords_, and move in a Body; though we do not _See_ that Tye; nor _Hear_ the Words of Command. And so here.