ustain'd by that part, so that by
this means we may easily calculate the height of 999. divisions of those
1000. divisions, I suppos'd; whereas the uppermost may extend it self more
then as high again, nay, perhaps indefinitely, or beyond the Moon; for the
Elaters and Expansions being in reciprocal proportions, since we cannot yet
find the _plus ultra_, beyond which the Air will not expand it self, we
cannot determine the height of the Air: for since, as we have shewn, the
proportion will be alway as the pressure sustain'd by any part is to 35. so
1000. to the expansion of that part; the multiplication or product
therefore of the pressure, and expansion, that is, of the two extream
proportionals, being alwayes equal to the product of the means, or 35000.
it follows, since that Rectangle or Product may be made up of the
multiplication of infinite diversities of numbers, that the height of the
Air is also indefinite; for since (as far as I have yet been able to try)
the Air seems capable of an indefinite Expansion, the pressure may be
decreased in _infinitum_, and consequently its expansion upwards indefinite
also.

There being therefore such a difference of density, and no Experiment yet
known to prove a _Saltus_, or skipping from one degree of rarity to another
much differing from it, that is, that an upper part of the Air should so
much differ from that immediately _subjacent_ to it, as to make a distinct
superficies, such as we observe between the Air and Water, &c. But it being
more likely, that there is a continual increase of rarity in the parts of
the Air, the further they are removed from the surface of the Earth: It
will hence necessarily follow, that (as in the Experiment of the salt and
fresh Water) the ray of Light passing obliquely through the Air also, which
is of very different density, will be continually, and infinitely
inflected, or bended, from a streight, or direct motion.

This granted, the reason of all the above recited _Phaenomena_, concerning
the appearance of the Celestial Bodies, will very easily be deduced. As,

First, The redness of the Sun, Moon, and Stars, will be found to be caused
by the inflection of the rays within the _Atmosphere_. That it is not
really in or near the luminous bodies, will, I suppose, be very easily
granted, seeing that this redness is observable in several places differing
in Longitude, to be at the same time different, the setting and rising Sun
of all parts being f