CANNON 



■!fc'^a,V>J 





Fig. 73. Detail of square No. I, on low hills north of Biskra. 



^^1^' 



A 







... '/'-M^ 



^i 





■» - ■ -J». 



, *-> 



r^*ar;-i.---5^:^ie^i^^.z-;:5^ 



^M 



■*v'. 



.* 







Fig. 74. Vegetation of north slope of the low hills which are north of Biskra. Ferula vescentensis is 



the perennial appearing in the figure. 



