From [A. J. F.] Yvon Villarceau   [18 May 1849]

The transcript of this letter is not available online on Ɛpsilon.

Please cite as “Herschel13608,” in Ɛpsilon: The Sir John Herschel Collection accessed on 27 April 2024, https://epsilon.ac.uk/view/herschel/letters/Herschel13608