VIII] 



SAND DUNES 



133 



means the area of the Dune will be extended, and 

 its growth to a greater height will be possible. A 



Fig. 23. A dense mat of Marram Grass from which the sand has 

 been washed away by the waves at high water, so as to show the 

 horizontal rhizomes and the roots in their natural positions a8 

 they were embedded in the sand. 



third point, which will give a peculiar advantage in 

 Dune-formation, is the capacity of the plant for 



