Copy of a letter, from John Frederick William Herschel to Richard Sheepshanks, dated at 32 Harley St. Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Will speak to the Duke [of Northumberland, Algernon Percy] at the earliest opportunity and encloses a draft note to Adolph Petersen at Altona [see Richard Sheepshanks's 1852-5-14]. 19 May 1852