[10]Op. cit., vol. IV.
[11]The positions of the two points of connection in the valley were determined by Capt. Lyons in 1896.
The return traverse via Farafra to Assiut is left out of consideration owing to its great length and consequent low value in the determination of the longitude of Zubbo. It agrees however, very closely with the others, owing to compensation of errors.
[12]Lyons, Proceedings of the Royal Society, vol. 71.
[13]Op. cit.
[14]The occurrence of this fern in the ravines of the Fayum may also be recorded here.
[15]Beadnell, H. J. L., Geological Magazine. Jan., 1900, No. 427, pp. 46-48; The Cretaceous Region of Abu Roash, near the Pyramids of Giza. Geol. Surv. Egypt, Report 1900, Part II, 1902.
[16]See Reports of the Geological Survey on Farafra, Kharga and the Eastern Desert.