Copy of draft letter, from Sir John Herschel to David Brewster Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Has received copies of reprints from Lyell. Points out errors in a printed paper of his. Has been unwell and very busy of late. Would like to add David Brewster's name to the Optical Glass Committee. 28 November 1825