De dysenteria theses

XIX.
The large intestines are easy to heal; conversely, those that are thin are difficult. The jejunum, however, is entirely incurable, both because of the size and multitude of its vessels, and because its nervous tunic is very thin (Galen, Method of Healing 6).

XX.
Intestines are ulcerated beyond any hope of help by black bile; by yellow bile, however, they admit to healing with difficulty (Galen, On Black Bile; Hippoc. 3, Aphorisms 24).

XXI.
Ulceration induced by salty phlegm holds a middle place, not because it is more biting than bile, but because it does not act by passing through like that, but rather gnaws by adhering longer due to its viscosity.

XXII.
But from whatever cause the disease has arisen, if it has proceeded to the point that certain fragments and somewhat larger shreds of intestinal substance are excreted, the hope of healing is very small or rather non-existent.

XXIII.
In the cure, three things must be looked to: that the cause be removed, that the disease be assisted, and that the symptoms which are too distressing be mitigated.