e thereby, as, the rising of _Liquors_ in a _Filtre_, the rising
of _Spirit of Wine_, _Oyl_, _melted Tallow_, &c. in the _Week_ of a _Lamp_,
(though made of small _Wire_, _Threeds_ of _Asbestus_, _Strings_ of
_Glass_, or the like) the rising of _Liquors_ in a _Spunge_, piece of
_Bread_, _Sand_, &c. perhaps also the ascending of the _Sap_ in _Trees_ and
_Plants_, through their small, and some of them _imperceptible pores_, (of
which I have said more, on another occasion) at least the passing of it out
of the earth into their roots. And indeed upon the consideration of this
Principle, multitudes of other uses of it occurr'd to me, which I have not
yet so well examined and digested as to propound for _Axioms_, but only as
_Queries_ and _Conjectures_ which may serve as _hints_ toward some further
_discoveries_.

As first, Upon the consideration of the _congruity_ and _incongruity_ of
Bodies, as to _touch_, I found also the like _congruity_ and _incongruity_
(if I may so speak) as to the _Transmitting_ of the _Rates_ of Light: For
as in this regard, _water_ (not now to mention other Liquors) seems nearer
of affinity to _Glass_ then _Air_, and _Air_ then _Quicksilver_: whence an
_oblique Ray_ out of _Glass_, will pass into _water_ with very little
_refraction_ from the _perpendicular_, but none out of _Glass_ into _Air_,
excepting a _direct_, will pass without a very great refraction from the
perpendicular, nay any oblique Ray under thirty degrees, will not be
admitted into the Air at all. And _Quicksilver_ will neither admit oblique
or direct, but reflects all; seeming, as to the transmitting of the Raies
of Light, to be of a quite differing constitution, from that of _Air_,
_Water_, _Glass_, &c. and to resemble most those opacous and strong
reflecting bodies of Metals: So also as to the property of cohesion or
congruity, Water seems to keep the same order, being more congruous to
Glass then Air, and Air then Quicksilver.

A Second thing (which was hinted to me, by the consideration of the
included fluids globular form, caused by the protrusion of the ambient
heterogeneous fluid) was, whether the _Phaenomena_ of gravity might not by
this means be explained, by supposing the _Globe_ of Earth, Water, and Air
to be included with a _fluid_, heterogeneous to all and each of them, so
subtil, as not only to be every where _interspersed_ through the _Air_, (or
rather the _air_ through it) but to _pervade_ the bodies of _Glass_, and