Copy letter, from Sir John Herschel to George Gabriel Stokes, dated at Collingwood Copy of a letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Thanks for the magnetic theory [see George Gabriel Stokes's 1856-7-9] and agrees it argues against John Frederick William Herschel's ideas about Mahomet's coffin. Describes some interesting magnetic experiments John Frederick William Herschel has seen. 14 July 1856