Use "purgation" in a sentence

1. "We first had a feeling of siccity in the pharynx, then intolerable pains at the epigastrium, super purgation, coma

2. He does not admit Aristotle's theory, that tragedy or other serious imitations are a purgation of the passions by pity and fear; to him they appear only to afford the opportunity of indulging them

3. Yes, he said, and a rare purgation

4. Yes, I said, not the sort of purgation which the physicians make of the body; for they take away the worse and leave the better part, but he does the reverse