salt _Mines_, or else many of the saline parts of the Sea may be kept back,
though not all.

And as to the Second, The same _Spring_ may be fed and supplyed by divers
_Caverns_, coming from very far distant parts of the _Sea_, so as that it
may in one place be _high_, in another _low water_; and so by that means
the _Spring_ may be equally supply'd at all times. Or else the _Cavern_ may
be so straight and narrow, that the water not having so ready and free
passage through it, cannot upon so short and quick mutations of pressure,
be able to produce any sensible effect at such a distance. Besides that, to
confirm this _hypothesis_, there are many _Examples_ found in _Natural
Historians_, of _Springs_ that do ebb and flow like the Sea: As
particularly, those recorded by the Learned _Camden_, and after him by
_Speed,_ to be found in this _Island_: One of which, they relate to be on
the Top of a Mountain, by the small Village _Kilken_ in _Flintshire_,
_Maris æmulus qui statis temporibus suos evomit & resorbet Aquas_; Which at
certain times riseth and falleth after the manner of the Sea. A Second in
_Caermardenshire,_ near _Caermarden_, at a place called _Cantred Bichan_;
_Qui (ut scribit Giraldus) naturali die bis undis deficiens, & toties
exuberans, marinas imitatur instabilitates_; That twice in four and twenty
hours ebbing and flowing; resembleth the unstable motions of the Sea. The
_Phænomena_ of which two may be easily made out, by supposing the _Cavern_,
by which they are fed, to arise from the bottom of the next Sea. A Third,
is a Well upon the River _Ogmore_ in _Glamorganshire_, and near unto
_Newton_, of which _Camden_ relates himself to be certified, by a Letter
from a Learned Friend of his that observed it, _Fons abest hinc, &c._ The
Letter is a little too long to be inserted, but the substance is this; That
this Well ebbs and flows quite contrary to the flowing and ebbing of the
Sea in those parts: for 'tis almost empty at Full Sea, but full at Low
water. This may happen from the Channel by which it is supplied, which may