Fig. 20. A Flood Chaxnkl near Jericho, dry except for a few 



DAYS OR EVEN HOURS IN THE YEAR. {PhotO : P. A. Buxton.) 



Fig. 21. — Bed of a Wadi at Biskra in the Algerian Sahara, 

 SHOWING Bushes of Oleander {Nerium) and Tamarisk {Tamarix). 

 {Photo : V. H. W. Dowson.) 



