Animal Generation and Substance in Sennert and Leibniz
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\textlessdiv class="abstract" data-abstract-type="normal"\textgreater\textlessp\textgreaterINTRODUCTION\textless/p\textgreater\textlessp\textgreaterGottfried Leibniz is well known for his claim to have “rehabilitated” the substantial forms of scholastic philosophy, forging a reconciliation of the New Philosophy of Descartes, Mersenne, and Gassendi with Aristotelian metaphysics (in his so-called \textlessspan class=’italic’\textgreaterDiscourse on Metaphysics\textless/span\textgreater, 1686). Much less celebrated is the fact that fifty years earlier (in his \textlessspan class=’italic’\textgreaterHypomnemata physica\textless/span\textgreater, 1636) the Bratislavan physician and natural philosopher Daniel Sennert had already argued for the indispensability to atomism of (suitably reinterpreted) Aristotelian forms, in explicit opposition to the rejection of substantial forms by his fellow atomist Sébastien Basson.\textless/p\textgreater\textlessp\textgreaterIn this essay I want to set Leibniz’s philosophy in a novel perspective by comparing it with Sennert’s anticipation of his reintroduction of substantial forms. And I shall be doing this by looking at motivations for his theory of substance in his views on biological generation. I shall be especially concerned with the genesis of Leibniz’s views and therefore with the context of his youthful commitment to atomism in the period from roughly 1666 to 1678. And I shall argue here, by a comparison with the case of Sennert, that this atomism, rather than being irrelevant to his mature philosophy of substantial forms and monads, actually throws considerable light on it. For it turns out that, despite the huge differences in the contexts in which the young Leibniz and Sennert wrote and in the details of their views, there is a fair degree of commonality between the two in their motivations.\textless/p\textgreater\textless/div\textgreater