WAS CARTESIAN SCIENCE EVER MEANT TO BE A-PRIORI - A COMMENT ON HATFIELD - DISCUSSION

In a recent article G. Hatfield claims that Descartes for a certain ti me thought a purely a priori science to be possible. Hatfield's eviden ce consists of his reading of the Cartesian method in the Regulae and of a letter to Mersenne, written in May 1632. I argue that Hatfield mi sinterprets the Cartesian method and Descartes' claim in the letter to Mersenne. I first show that the latter does not argue for an a priori science. Then, I show that the method of the Regulae is not a priori. Finally, I propose a reading of Descartes' letter.