Abstract

Descartes was disappointed with most of the Objections collected to accompany the Meditations in 1641, but he took a particularly dim view of the Third Set. ‘I am surprised that I have found not one valid argument in these objections,’ he wrote, close to the end of a series of curt and dismissive replies. The author of the objections was Thomas Hobbes. There was one other unfriendly exchange between Descartes and Hobbes in 1641. Descartes received through Mersenne some letters criticizing theses in the Dioptrics, one of the Essays published with the Discourse on Method in 1637. Mersenne did not name Hobbes as the writer of the letters, attributing them to an unspecified Englishman, and it seems that Descartes never connected the critic of his optics with the author of the objections to his metaphysics. Nevertheless, Descartes responded with some hostility to the letters, angrily rebutting some points about refraction and charging that others had been appropriated from his own writings. Insinuating that the English correspondent was dishonest, Descartes decided to have no more to do with him. A meeting between the two men did take place in 1648 at a dinner given by the Marquis of Newcastle, but even on this occasion they did not see eye to eye, getting into an argument about the nature of hardness.