Letter, from George Gabriel Stokes to Sir John Herschel, dated at Laurel Lodge, Barnet Autographed letter . Continues comments on fluorescence from letter of 1856-7-8; then shows mathematically that John Frederick William Herschel's solution for the problem of Mahomet's coffin [see George Gabriel Stokes's 1856-7-1] will not work. 9 July 1856