Orazio Ricasoli Rucellai is one of the leading eruditi of the second half of 17th-century Florence; he tried to keep alive Galileo’s contribution to science. Most of his Dialoghi filosofici have been published at the end of 19th century; among the unpublished dialogues dedicated to Timaeus we find a partial defence of Descartes’ metaphysics, which is edited in the Appendix. In particular, the topics at stake are the demonstration of God’s existence and of the immateriality of the (...) soul in Descartes’s Meditationes. The opponent of Descartes’s doctrine relies on Gassendi’s Obiectiones. Descartes’s doctrine of ideas completely detached from sense perception is dismissed as useless on a cognitive basis, and only a generic innatism is maintained, only as far as it can provide a proof of God’s imprint on human soul. (shrink)