Abstract
In this chapter I provide a reconstruction of the contents of the lectures provided by Burchard de Volder by means of experiments at Leiden, in the years 1676–1678, as well as of the natural-philosophical interpretation he provided of the experimental evidences he gained. Such lectures, mostly based on the experiments described by Boyle, served De Volder to teach natural-philosophical ideas which he borrowed from Descartes, and which he re-interpreted in the light of Archimedes’s hydrostatics.