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



1917. Pl. 6. 



(a). Acacia arabica var. kraiissiana growing near nest of 1 cnnes 



trincrv'ms. 



•,■.<:- >«~^>?T 



y-'-^ii 





..^' 



(&). Donga showing root system of Acacia arabica var. kraiissiaiia. 



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



