y are called) they have also
vast In-draughts of some hundred Miles within Land; which when the Tydes
are out, do lye (in a manner) quite dry: And may therefore very well be
supposed to participate the effect of the Menstrual Tydes many dayes after
the {285} cause of them happens in the open Sea, upon a like ground as in
Straights and narrow Channels the Diurnall Tydes happen some hours later
than in the Ocean. And a like account must be given of particular accidents
in other places, from the particular situation of those places, as _Bays_,
_Chanels_, _Currents_, &c.

5. To the 5. Objection, _That the Spring-Tydes happen not, with us, just at
the Full and Change, but two or three daies after_. I should with the more
confidence attempt an Answer, were I certain, whether it be so in the
_Open_ Seas, or onely in our Channels. For the Answers will not be the same
in both cases. If onely in our Channels, where the Tydes find a large
in-draught; but not in the Open Seas: we must seek the reason of it from
the particular position of these places. But if it be so generally in the
wide Open Seas: We must then seek a reason of it from the general
Hypothesis. And, till I know the matter of Fact, I know not well, which to
offer at; lest whilst I attempt to salve one, I should fall foul of the
other. I know that Marriners use to speak of Spring-Tydes at the New and
Full of the Moon; though I have still had a suspition that it might be some
daies after, as well in the open Seas, as in our narrower Channels; (and
therefore I have chosen to say, in my Papers, _About_ the New and Full,
rather than _At_ the New and Full; and even when I do say _At_, I intend it
in that laxer sense in which I suppose the Marriners are to be understood,
for _Neer_ that time:) Of which suspition you will find some intimations
even in my first Papers: But this though I can admit; yet, because I was
not sure of it, I durst not build upon it. The truth is, the Flux and
Reflux of water in a vessel, by reason of the jogging of it, though it
follow thereupon; yet is, for the most part, discernable some time after.
For there must, upon that jog, be some time for Motion, before the
Accumulation can have made a Tyde. And so I do not know but that we must
allow it in all the Periods. For as the _menstrual_ High Tyde, is not (at
least with us) till some Daies after the Full and Change; so is the
_Diurnal_ High water, about as many Hours, after the Moons comming to
Sout