James Augustus Grant, CB, CSI, FRS, FRGS (11 April 1827  11 February 1892) was a Scottish explorer of eastern equatorial Africa. In 1860 Speke joined John Hanning Speke in the memorable expedition which solved the problem of the Nile sources. The expedition left Zanzibar in October 1860 and reached Gondokoro, where the travellers were again in touch with what they regarded as civilization, in February 1863. Speke was the leader, but Grant carried out several investigations independently and made valuable botanical collections. In 1864 he published, as supplementary to Speke's account of their journey, A Walk across Africa, in which he dealt particularly with 'the ordinary life and pursuits, the habits and feelings of the natives' and the economic value of the countries traversed.