.in.if'TArfox 



41 



and a thick leather)- skin, which would enable it 

 to bear a hot, dr\' climate. It tlui> nn'niics the 

 yiaiit cacti of Mexico. 



We ma\' trace another contrast in om" comnion 



I. A'ni.l.VA WAI.KKklANA {il Ihiizil Id II Olilllil). 



L;roun(lsel and the larL;e succulent L;'roundsels of the 

 Cape and the ("anar)- isles, w ith their thick Hesh)- 

 lea\es, the difference in form and texture being 

 simpl}' an expression of the w(jnderful modification 

 due to climate. 



