Letter listing for 1640–1649
- René Descartes to Henri Le Roy, December 1641 [translation from Latin into English]
- René Descartes to Henri Le Roy, December 1641 [translation from Latin into English]
- René Descartes to Guillaume Gibieuf, 19 January 1642 [translation from French into English]
- René Descartes to père Marin Mersenne, 19 January 1642 [translation from French into English]
- René Descartes to Henri Le Roy, 25 January 1642 [translation from Latin & French into English]
- René Descartes to Constantijn Huygens, 31 January 1642 [translation from French into English]
- René Descartes to Henri Le Roy, 28 February 1642 [translation from Latin into English]
- René Descartes to père Marin Mersenne, March 1642 [translation from French into English]
- René Descartes to [unknown], March 1642 [translation from Latin into English]
- René Descartes to Constantijn Huygens, 26 April 1642 [translation from French into English]
- René Descartes to Henri Le Roy, June 1642 [translation from Latin into English]
- Robert Boyle to Richard Boyle, 1st earl of Cork, 4 June 1642
- Robert Boyle to Lewis Boyle, Viscount Kinalmeaky, 11 August 1642
- Richard Boyle, 1st earl of Cork to Robert Boyle and Isaac Marcombes, before 30 September 1642 [now missing]
- René Descartes to Alphonse Pollot, 6 October 1642 [translation from French into English]
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