Published online by Cambridge University Press: 01 April 2022
In a recent article G. Hatfield claims that Descartes for a certain time thought a purely a priori science to be possible. Hatfield's evidence 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 misinterprets 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.
This paper is the result of a long discussion with Dennis Des Chene, whose contribution, thus, is invaluable. I would like also to thank Stephen Barker for reading a draft of this paper and making some very helpful remarks.
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