s_, having in his lately printed _Hypothesis_ of
Tides intimated, that he had reason to believe, that the _Annual
Spring-tides_ happen to be rather about the beginnings of _Febr._ and
_Nov._ than the two _AEquinoxes_, doth in a late Letter to the _Publisher_,
written from _Oxford_ in _Aug._ last, desire, that some understanding
Persons at _London_, or _Greenwich_, but rather nearer the Sea, or upon the
Sea-shore, would make _particular_ Observation of all the _Spring-Tides_
(_New-Moon_ and _Full-Moon_) between this and the End of _November_; and
take account of the _Hour_, and of the _Perpendicular height_: that we may
see, whether those in _September_, or those of _November_ be highest: And
it were not amiss, the Low waters were observed too. Which may be easily
done by a mark made upon any standing Post in the Water, by any {298}
Water-man, or other understanding Person, who dwells by the Water-side.

It would also deserve (thinks he) to be inquired into, whether, when the
Tides be highest, the Ebbs be ever lowest, & _contra_; (which is generally
affirmed, and almost put out of question) or rather (which sutes best with
this _Hypothesis_) whether, when the Tides are highest, both in the
_Annual_ and _Menstrual_ Periods, the Low waters be not also highest; and
at Neap Tides, the Ebbes also very low.

He adds, that he should expect, that the Spring Tides now coming, and those
at the beginning of _September_, should not be so high, as those at the
_middle_ of _September_; and then lower again at the _beginning_ of
_October_, and after that, higher at the _middle_ of _October_, and higher
yet about the _beginning_ of _November_ (at the usual times of
_Spring-tides_ after the _New_ and _Full_.)

* * * * *

_Considerations and Enquiries concerning _Tides_, by Sir _Robert Moray_;
likewise for a further search into Dr. _Wallis's_ newly publish't
_Hypothesis_._

In regard that the High and Low waters are observed to increase, and
decrease regularly at several seasons, according to the Moons age, so as,
about the _New_ and _Full Moon_, or within two or three daies after, in the
Western parts of _Europe_, the _Tides_ are at the _highest_, and about the
_Quarter-Moons_, at the _lowest_, (the former call'd _Spring-tides_, the
other _Neap-tides_;) and that according to the height and excesses of the
_Tides_, the _Ebbes_ in opposition are answerable to them, the heighest
Tide having the lowest Ebbe