An account of travels into the interior of southern Africa, in the years 1797 and 1798 : including cursory observations on the geology and geography of the southern part of that continent; the natural history of such objects as occurred in the animal, vegetable, and mineral kingdoms; and sketches of the physical and moral characters of the various tribes of inhabitants surrounding the settlement of the Cape of Good Hope : to which is annexed, a description of the present state, population, and produce of that extensive colony : with a map constructed entirely from actual observations made in the course of the travels