S.A. Assn. for Adv. of Science. 



191/. PL. 7. 



(a) Base of Colonization in a Ra\ine. 





^'..?--- 



-s^ 



7/) Invasion of the grass veld bv Thorn Trees. 



Prof. J. W. Bews,— Plant Succession in the Thorn Veld 



