Copy of draft letter, from Sir John Herschel to Dionysius Lardner, dated at Slough Copy of draft letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Has considered Dionysius Lardner's request to the best of his ability and thinks that he will be able to write the preliminary essay in about six months' time. Regarding his friend Thomas Greenwood of the Inner Temple, will be able to put Dionysius Lardner in touch with him. 1 February 1830