Plant Defences 1 1 3 



faces, and so are prevented from cooling too rapidly. It is the 



Fig. 99. — Seedlings of Black Wattles {Acacia melanoxylon, R. Br.). 



Fig. 100. — Branch of y^^aaVz melanoxylon, R. Br., showing phyllodes(rt', b). 

 (From Thom6 and Bennett's " Structural and Physiological Botany ",) 



position of the upper leaves which gives such a delicate tracery 

 against the sky. 



8 



