To Algernon Percy (4th Duke of Northumberland)   1850-6-9 or later

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

Please cite as “Herschel12495,” in Ɛpsilon: The Sir John Herschel Collection accessed on 27 April 2024, https://epsilon.ac.uk/view/herschel/letters/Herschel12495