Copy of letter, from Sir John Herschel to William Lassell, 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. Is dismayed to find in the new edition of his own Outlines Astr. that he has attributed the discovery of Hyperion to W. R. Dawes without crediting William Lassell; will have this corrected in a future edition. The draft version is annotated "original seen" by the copyist. 15 September 1858