[Footnote 6: That even occasional rains can effect a considerable amount of erosion of soft materials is shown by the present state of these domes, from which a skin of some thickness has been washed away, leaving the surfaces bristling with the sharp fragments of rock which were included in the original mixture of sand and clay from which the bricks were manufactured.] [Footnote 7: The royal cubit was the chief unit of length, and measured 20·6 inches; 300 and 500 cubits would therefore be equivalent to 515 and 858 feet respectively.] [Footnote 8: The Headquarters of the Corporation of Western Egypt, Limited (see map).] [Footnote 9: I should like to record my indebtedness to Mr. Garsed, who, while in the oasis, undertook, at my request, a considerable amount of special analytical work, in addition to his regular duties.] [Footnote 10: ‘The Nile Flood and Rains of the Nile Basin, 1906,’ Survey Department, Cairo, 1907; ‘Some Geographical Aspects of the Nile,’ the _Geographical Journal_, November, 1908, vol. xxxii., No. 5.] [Footnote 11: ‘The Dead Heart of Australia’; John Murray, London, 1906.] [Footnote 12: ‘The Hydraulic Aspect of the Artesian Problem,’ Proceedings of the Royal Society of New South Wales, vol. xxxvii., p. 30.] [Footnote 13: ‘Egyptian Irrigation,’ second edition, E. and F. N. Spon, Limited, London, 1899.] [Footnote 14: ‘The Great Sahara,’ by H. B. Tristram; John Murray, London, 1860. See also ‘Tropical Agriculture,’ by P. L. Simmonds.] Transcriber's note: pg 3 Changed: latitudina direction to: latitudinal Spelling and formatting inconsistencies have been left unchanged