The time of using them, any body may know without teaching, viz. when the ulcer is cleansed and filled with flesh, and such symptoms as hinder are taken away.

For many times ulcers must be kept open that the sanies, or fords that lie in them may be purged out, whereas of themselves they would heal before.

Only beware, lest by too much binding you cause pain in tender parts.

CHAPTER XIII.
Of Medicines resisting poison.

Such medicines are called Alexiteria, and Alexipharmaca, which resist poison.

Some of these resist poison by astral influence, and some physicians (though but few) can give a reason for it.

These they have sorted into three ranks:

1. Such as strengthen nature, that so it may tame the poison the easier.

2. Such as oppose the poison by a contrary quality.