[10]See R.G.S.J. “The Nature and Formation of Sand Ripples and Dunes,” March, 1916, pp. 189-209. “Study of a Dune Belt,” January, 1918, pp. 16-33. Discussion on the latter paper, April, 1918, pp. 250-258.

[11]“Customs, Superstitions and Songs of the Western Oases,” Cairo, Aug., 1914.

[12]“Irrigation in Dakhla Oasis,” R.G.S.J., Nov., 1917.

[13]“The Geographical Distribution of some Plants from the Libyan Desert,” Cairo, Oct., 1913.

[14]Calotropis procera.

[15]Malva parviflora, L.

[16][p. 146.]

[17][p. 262.]

[18]“North American Deserts.” Prof. D. T. MacDougal, R.G.S.J. Vol. XXXIX, No. 2.

[19]“Problems in Exploration: Africa.” By F. R. Cana, R.G.S.J., Nov., 1911, p. 464.