The expedition arrived at Lake Tanganyika on 13 February 1858. Burton was awestruck by the sight of the magnificent lake, but Speke, who had been temporarily blinded, was unable to see the body of water. By this point much of their surveying equipment was lost, ruined, or stolen, and they were unable to complete surveys of the area as well as they wished. Burton was again taken ill on the return journey; Speke continued exploring without him, making a journey to the north and eventually locating the great Lake Victoria, or Victoria Nyanza, on 3 August. Lacking supplies and proper instruments, Speke was unable to survey the area properly but was privately convinced that it was the long-sought source of the Nile. Burton's description of the journey is given in "Lake Regions of Equatorial Africa" (1860). Speke gave his own account in "The Journal of the Discovery of the Source of the Nile" (1863).