[4]Rohlfs, “Kufra,” 1881, p. 226.
[5]“Mitt. Afrik. Ges.,” Band ii., 1880-81, p. 17.
[6]“Mitt. Afrik. Ges.,” Band ii., 1880-81, p. 25.
[7]“Mitt. Afrik. Ges.,” Band ii., 1880-81, p. 23.
[8]“Geographical Journal,” Vol. 68 (1921), p. 248.
[9]“Geographical Journal,” Vol. 42 (1913), p. 282.
[10]“Geographical Journal,” Vol. 46 (1920), p. 98.
[11]Though rare in the Western Desert of Egypt, these rock-basins are common in the mountains of the Eastern Desert near the Red Sea, where they are called galts. See my “Geography and Geology of South-Eastern Egypt” (1912), p. 240. They are also abundant in the Erdi and Ennedi regions of French Equatorial Africa, as we know from the explorations of both Lieutenant-Colonel Tilho and Hassanein Bey.