Copy of letter, from Sir John Herschel to Richard Anthony Proctor, 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. Thanks Richard Anthony Proctor for sending Richard Anthony Proctor's Other Worlds than Ours and supplies comments, some favorable, on numerous claims made therein, e.g., on Richard Anthony Proctor's theory that Jupiter and Saturn are hot and to some degree luminous. 11 May 1870