Copy letter, from Sir John Herschel to James Haig[?], 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 for his books. Encloses one of his own pamphlets on Atoms, which will show his personal view of mind versus matter. Comments on some of Haig's terminology. 1 July 1864