Oops, Peiresc and Kircher were in contact in 1633... So if the letter was 1633, this could hold the reply. It seems illegible though :-/ 24. Kircher, Athanasius, and Christoph Scheiner. Letter to Peiresc, Nicholas Claude Fabri de, 1 December 1633, Paris, Bibliothèque Nationale. Call Number: BN FF 9538 f.234r-v Notes: Consulted 23/6/1995. Microfilm (illegible): 5016 Cheers, Gabriel