Copy of draft letter, from Sir John Herschel to George A. MacFarren, dated at Collingwood Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Is obliged for GM's letter and for the trouble he has taken over John Frederick William Herschel's paper on musical scales. Object in writing this paper was to clear the ground as it were. Elucidates some of the points in his own paper and comments on parts of GM's paper. 16 November 1868