ur Commands, an Account of my thoughts, as
to this matter, though yet immature and unpolished: What use you will
please to make of them, I shall leave to your prudence, &c.

* * * * *

_An _APPENDIX_, written by way of Letter to the _Publisher_; Being an
answer to some Objections, made by several Persons, to the precedent
Discourse._

I Received yours; and am very well contented, that _objections_ be made
against my _Hypothesis_ concerning _Tydes_: being {282} proposed but as a
conjecture to be examined; and, upon that Examination, rectified, if there
be occasion; or rejected, if it will not hold water.

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.

2. To the second objection; _That, at Chatham and in the Thames, the Annual
Spring-tydes, happen about the AEquinoxes; not (as this Hypothesis doth
suppose elsewhere to have been observed)