A private journal kept during the Niger Expedition, from the commencement in May, 1841, until the recall of the expedition in June, 1842.

London, Shaw, 1843. . First edition. 8vo, xii, 139pp., original plum cloth gilt, blindstamped borders and centre-pieces to covers, light fade to spine, a very good copy of a scarce book. Simpson joined the ill-fated expedition to observe the negotiations with the Nigerian chiefs to abolish slavery.