 There is no official record of La Forge’s death. However, Clerselier confirmed in the preface to the third volume of Descartes’ correspondence (which was printed in September 1666) that La Forge had died soon after publishing his Traité de l’Esprit de l’Homme (Clerselier 1667: Preface ã2). It seems likely that he died sometime in early 1666, at the age of thirty-three.