Copy letter, from Sir John Herschel to S. Langley, dated at Collingwood Copy of letter, copied as part of the correspondence project led by Colonel John Herschel FRS following the death of his father. Answer has been delayed as SL's letter was directed to MacMillans. Can be no two opinions on the contribution to scientific knowledge of Sir John Lubbock. Has full confidence in his political opinions. 25 October 1868