Copy letter, from Sir John Herschel to George Peacock, dated at Collingwood Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Replying to George Peacock's 1847-6-28, is worried about the amount of time that will be required of John Frederick William Herschel in preparing a suitable biography; does not want it to interfere with other work on hand. 30 June 1847