PRESIDENT S ADDRESS. 



muaatnc 



SYDNEY 



Fig. 4. — Restoralioii of ilie " Sliualliawke " vallev, bounded by the 

 littonil ridge wliicli fiiiitrolleil the foiiner drainage .system. Young streams 

 cutting aciDSS lluit ridge are now dismembering the old marginal into new 

 subradial valleys. lieyoiid the Pacific watershed, the arrow overlies an 

 area of parallel hills and valleys compressed from east to west. 



