Abstract

We edited and translated a so far unpublished manuscript ("Sur la generation des insectes et d'autres petits animaux") drafted by Leibniz in 1714. The text is written on the same paper of the first draft of the "Monadology" and, as we show, there is a connection between these two texts of the late Leibniz, as far as in the "Monadology" , the rejection of the traditional theory of the spontaneous generation of small animals (like insects) is considered by Leibniz as a posteriori confirmation of his preformist theory. In addition to that, this piece shows that Leibniz was deeply influenced by the experimental results in biology and natural sciences, and, especially, by the works of Italian scientits of the Galilean tradition, like Francesco Redi and Antonio Vallisneri.