Geological observations on the volcanic islands : visited during the voyage of H.M.S. Beagle, together with some brief notices on the geology of Australia and the Cape of Good Hope : being the second part of the Geology of the Beagle, under the command of Capt. Fitzroy ... during the years 1832 to 1836 / by Charles Darwin. Published with the approval of the Lords Commissioners of Her Majesty's Treasury. - London, 1844, 8vo. pp. 175. - With a Plan of the Island of Ascension, and numerous wood-cuts.