And from this Notion of it,
we may easily give a more Intelligible reason how the Air becomes so
capable of _Rarefaction_ and _Condensation_. For, as in _tinctures_, one
grain of some _strongly tinging_ substance may _sensibly_ colour some
_hundred thousand_ grains of _appropriated_ Liquors, so as every _drop_ of
it has its proportionate share, and be sensibly ting'd, as I have try'd
both with _Logwood_ and _Cocheneel_: And as some few grains of _Salt_ is
able to infect as great a quantity, as may be found by _praecipitations_,
though not so easily by the _sight_ or _taste_; so the _Air_, which seems
to be but as 'twere a _tincture_ or _saline substance, dissolv'd and
agitated by the fluid and agil AEther_, may disperse and _expand_ it self
into a _vast space_, if it have room enough, and infect, as it were, every
part of that space. But, as on the other side, if there be but some _few
grains_ of the liquor, it may _extract all_ the colour of the tinging
substance, and may _dissolve_ all the Salt, and thereby become _much more
impregnated_ with those substances, so may _all_ the air that sufficed in a
_rarfy'd state_ to fill some _hundred thousand_ spaces of AEther, be
compris'd in only _one_, but in a position proportionable _dense_. And
though we have not yet found out such _strainers_ for Tinctures and Salts
as we have for the Air, being yet unable to _separate_ them from their
dissolving liquors by any kind of _filtre_, without _praecipitation_, as we
are able to _separate_ the Air from the AEther by _Glass_, and several
other bodies.
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