Abstract
In a recent paper, Keith Hutchison has advanced the thesis that the Mechanical Philosophy represents a shift towards supernaturalism in our conception of the physical world. This paper concentrates on one of the great problems of seventeenth-century biological theory — animal generation — to illustrate (and modify) Hutchison's thesis, thereby also serving to locate one role of the life sciences in the Scientific Revolution. This choice of focus enables us to draw heavily on Jacques Roger's seminal work on animal generation to illuminate the change that occurs, within the Mechanical Philosophy, between Descartes and Malebranche. Once the necessary distinctions have been drawn, it is argued, it will be seen that (in one important sense) this is a shift from naturalism to supernaturalism, brought about largely by problems native to the life sciences