CANNON 



PLATE 22 



J'i.-^^'^PS*' 



Fig. 51. Vegetation, mainly Ephedra and Retama, of the western edge of the Chott Mellala. 



.■^^Sf 



Fig. 3id. Approach to western edge ol the l_hoU iMellala, snowing ciiaracicristic rounaca iiius, oi mamclons. 



