Plant Defences \ i 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 o\ Acacia melanoxylon, R. Br., showing phyllodes (<?, b). 

 (From Thom^ and Bennett's " Structural and Physiological Botany ". ) 



position of the upper leaves which gives such a delicate tracery 

 against the sky. 



S 



