 At this time Hobbes also had a series of interactions with Descartes. In 1640 Hobbes sent to Mersenne a set of comments on Descartes’s Discourse and Optics. Descartes saw some of this, and sent a letter to Mersenne in response, to which Hobbes also responded. Then in 1641 Hobbes’s objections were among those published along with Descartes’s Meditations. In these exchanges and elsewhere, the attitudes of Hobbes and Descartes to one another involved a curious mixture of respect and dismissal. On the one occasion they are said to have met, in 1648, they did not get along well (Martinich 1999, 171). In earlier letters, Descartes suggested that Hobbes was more accomplished in moral philosophy than elsewhere, but also that he had wicked views there (Descartes 1643, 3.230–1). Descartes also worried that Hobbes was “aiming to make his reputation at my expense, and by devious means” (Descartes 1641b, 100). Aubrey reports that the two “mutually respected one another”, but also that Hobbes thought that Descartes would have been better off sticking to geometry (Aubrey 1696, 1.367).