The two “physico—mechanical” dissertations by the Swiss mathematician Johan Bernoulli, “On Effervescence and Fermentation” and “On the Movement of Muscles,” published here for the first time in English translation by Paul Maquet, are treatises belonging to the 17th century European academic tradition. In both works the author employs the new mechanical philosophy of science. Contents of this volume: Introduction by Troels Kardel, M.D., including a short biography of Bernoulli; the translated texts of the two dissertations; references; and glossary. Illustrations.