THE NORTH TEMPERATE ZONK 



61 



and between them is a barren plateau with an elevation of about 



3,000 feet. 



Back of the coast extends for fifty miles or more a broken region, 

 the "Tell," largely covered in its original state, by a dense growth 

 of evergreen shrubs, the "macchie" of the Italian Riviera, and 

 composed largely of the same Bpecies. 



Further inland there is a decided falling off in the rainfall, and 



MS- 



Fig. 9. — Dwarf palm {Chamaerops humilis) Cala Retjada, Majorca. 



Photo., Dr. H. Knoche. 



the base of the Great Atlas of Morocco is occupied by a barren 

 steppe. In Algeria this drier zone is characterized by the presence 

 of the Aleppo pine (Pinus Hcrtepensis), two junipers and a peculiar 

 conifer, Callitris quadri veil vis, the only representative of a genus, 

 otherwise restricted to the southern hemisphere. 



Where the rainfall exceeds GO cms., woods of cork oak and olives 

 occur on the lower slopes of the mountains, and in the drier dis- 

 tricts extensive growths of the scrub palms occur as they do in 

 southern Spain and Portugal. The Carob (Ceratonia sUiqua) is 

 also a common tree. 



