454 



ZONES AND REGIONS [Pt. Ill, Sect. II 



tliis case, therefore, tlic inferior limit of rainfall sufficient for high-forest 

 apparently is hardly reached, and the existence of the high-forest is asso- 

 ciated with water in the soil. 



To the east of the Knysna forest, the annual rainfall again falls to the 

 amount it shows on the west coast, that is to say, 50-70 cm. TIic rain, 

 Iiowcvcr, is HO longer 7viiiier rain, but cliicfly falls in spring and antninn, 

 and docs not fail at any season. There is also a complete change in the 

 vegetation. The selerophyllons xvoods disappear and are replaced by grass 

 savannahs ivith small acacias. Forest is confined to the river banks. 



Warm Temperate Grassland Climate. 



EAST CAPE COLONY LITTORAL SAVANNAH. 

 (After Dove, op. cit., p. 55 ff.) 



East London belongs to the east coast of Cape Colony. As we proceed 

 in a north-easterly direction, we enter Natal, and, with it, a district ivith 

 summer rain, but rain is also abundant in the spring. There is very little 

 rain in winter. 



The rainfall increases along the coast of Natal up to over 100 cm. 

 (Durban, 1,036 mm.) ; inland however, even at a slight distance from the 

 sea, it only amounts to about 60-75 cm., just as on the south coast of Cape 

 Colony. 



