Copy letter, from Sir John Herschel to James South, dated at Collingwood Contemporary copy in sender's hand, signed by sender. As John Frederick William Herschel has been approached by Charles Babbage for permission to publish certain portions of John Frederick William Herschel's correspondence, John Frederick William Herschel is writing to say that he gives both Babbage and James South permission to publish what they will. 20 December 1864