PLANT SUCCESSION. 



235 



centre of this runs a shallow valley well filled with trees. (In 

 order to simplify the description this valley is termed the "central 

 valley" throughout the remainder of this paper.) A very notice- 

 able feature is the almost complete absence of trees to the west of 

 this valley. Numerous clumps of trees occur in the grassland to 

 the east, but with one or two exceptions there are none at all to 

 the west. The accompanying map of the "central valley" and the 

 adjacent hillsides shows this very clearly. 



o t> 



SIGNAL HILL, MARITZBURG. 

 Showing distribution of clumps on slopes adjacent to "central" valley 



The numbered clumps are those described in detail in the 

 paper. 



A is a small Acacia ata.racantha growing in the open. 

 C is a small clump in which Clerodendron glabrvm is the 

 pioneer. 



2a 



