Copy letter, from Sir John Herschel to James David Forbes, dated at Slough Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Gives James Forbes permission to use John Frederick William Herschel's letter to James Forbes's brother in any way James Forbes sees fit to obtain the Chair of Natural Philosophy (at Edinburgh), but still does not wish directly to promote James Forbes's selection. Briefly discusses results of James Forbes's experiments with the actinometer. 7 December 1832