Autograph Letter Signed, to “My dear Balfour” [probably John Hutton Balfour (1808-1884), botanist, Keeper of the Royal Botanic Garden, Edinburgh], discussing in detail the classification of a specimen of moss. 2 pp. 7 x 4 inches, remains of guard where formerly mounted, in good condition. Friday morning [June 1853]. Dr Robert Kaye Greville (1794 – 1866), English mycologist, bryologist, and botanist. He was an accomplished artist and illustrator of natural history. He has a mountain in Queensland named after him. He compiled a number of important botanical books, including Algae Britannicae and Scottish Cryptogamic Flora. He published works on other subjects, such as Slavery and the slave trade in the United States of America; and the extent to which the American churches are involved in their support (Edinburgh, 1845). In 1840, Greville was one of the four vice-presidents at the World’s Anti-Slavery Convention at Freemason’s Hall in London on 12 June 1840.