Diatribae duae medico-philosophicae, quarum prior agit de fermentatione sive de motu intestino particularum in quovis corpore, altera de febribus sive de motu earundum in sanguine animalium.

Includes (De febribus, cap. X, XIV) first description of epidemic typhoid. English translation in his Practice of physick, 1684, Treatise II, 83-98, 1111-18.

Contains the earliest suggestion that fermentation is an intestinal or internal motion of particles; the analogy between putrefaction and fermentation is also noted.