THE PLANT ECOLOGY OF DltAKENSBEIiG RANGE. 517 



rivers) often rises in flood and comes down in the form of a 

 wall of water several feet high, which sweeps before it the 

 accumulated debris of the river-bed and rolls along large 

 stones, leaving the river-channel clean. 



Text-fig. 3. 



Vegelalion of 

 MountaiTt Top 



Liihophyles 



and 

 Chomophyles 



Fynbosch 



Tussoch Veld 



Liihophyles 



and 

 Chomophyles 



Prolea Veld 

 Greyiu Scrv,b 



Section through a buttress-slope of the main Drakensberg 

 escarpment. 



Where soil is able to accumulate it is quickly leached and 

 is usually very poor in chemical salts. The shales are of a 

 very friable character and are easily eroded. The sand- 

 stones among which they occur are more resistant. 

 Frequently, therefore, the shale beds are hollowed out under- 



