CHAPTER VII.

_Of cleansing Medicines._


Cleansing medicines can neither be defined by heat, nor coldness,
because some of both sorts cleanse.

A cleansing medicine, then, is of a terrene quality, which takes away
the filth with it, and carries it out.

_Definition._] Here, to avoid confusion, a difference must be made
between washing and cleansing.

A thing which washeth, carries away by fluxion, as a man washeth the
dirt off from a thing.

A cleansing medicine by a certain roughness or nitrous quality, carries
away the compacted filth with it.

This also is the difference between cleansing and discussing medicines,
the one makes thick humours thin, and so scatters them, but a cleansing
medicine takes the most tenacious humour along with it, without any
alteration.

Besides, of cleansing medicines, some are of a gentler nature, some are
more vehement.

These are not known one and the same way; for some are sweet, some
salt, and some bitter.

The use of cleansing is external, as the use of purges are internal.

They are used to cleanse the sanies and other filth of ulcers, yea, and
to consume and eat away the flesh itself, as burnt Alum, _precipitate_,
&c.

When these must be used, not only the effects of the ulcers, but also
the temperature of the body will tell you.

For if you see either a disease of fulness, which our physicians call
[_Plethora_] or corrupted humours which they call [_Cacochyma_] you
must empty the body of these, viz. fulness by bleeding, and corrupt
humours, or evil state of the body, by purging before you use cleansing
medicines to the ulcer, else your cure will never proceed prosperously.