ure. To this Opinion
I was somewhat the more induced by the relations I have met with in
_Geographical Writers_, of drawing fresh Water from the bottom of the Sea,
which is salt above. I cannot now stand to examine, whether this natural
perpetual motion may not artificially be imitated: Nor can I stand to
answer the Objections which may be made against this my Supposition: As,
First, How it comes to pass, that there are sometimes salt Springs much
higher then the Superficies of the Water? And, Secondly, Why Springs do not
run faster and slower, according to the varying height made of the Cylinder
of Sea-water, by the ebbing and flowing of the Sea?

As to the First, In short, I say, the fresh Water may receive again a
saline Tincture near the Superficies of the Earth, by passing through some
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 aemulus 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 _Phaenomena_ 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