Autograph Letter Signed, to W.Gourlie (”Respected Friend”), thanking him for “two obliging notes respecting the Agar-agar”. A good one page example, 7 x 4 inches. London, 4 November 1852. Uncommon. Daniel Hanbury FRS (1825 – 1875), British botanist and pharmacologist, one of the leading 19th century experts on pharmacognosy, the study of the medicinal applications of nature, principally of plants.