Brunschwig (1500) Liber pestilentialis
Brunschwig, Hieronymus. Liber pestilentialis de venenis epidimie: Das Buch der Vergift der Pestile[n]tz das da gena[n]t ist der gemein Sterbent der trüsen Blatren. Strassburg, 1500.
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Bad air will get you sick
Bad air was believed to be a major cause of sickness in the past, based on the idea of humours and miasma as the cause of disease.