Centuries II and III of Francis Bacon’s posthumous natural history Sylva Sylvarum are largely dedicated to sound. This paper claims that Bacon’s investigation on this topic is fruitfully read against the background of the Aristotelian theory of sound, as presented in De anima commentaries. I argue that Bacon agreed with the general lines of this tradition in a crucial aspect: he rejected the reduction of sound to local motion. Many of the experimental instances and more theoretical remarks from his (...) natural history of sound can be elucidated against this wider concern of distinguishing sound from motion, a theme that had been a staple of Aristotelian discussions of sound and hearing since the Middle Ages. Bacon admits that local motion is part of the efficient cause of sound, but he denies that it is its form, which means that sound cannot be reduced to a type of local motion. This position places him outside subsequent developments in natural philosophy in the seventeenth century. (shrink)