Copy of draft letter, from Sir John Herschel to William Whewell Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Comments favorably on a method developed by William Whewell for designating the faces of crystals. Presents a method John Frederick William Herschel had worked out previously, but writes on the letter: 'Not sent—On rereading his letter I find it is his idea—strange!' 1823-10-15 or later