Ipostelsia 19 



constant. The forest, in a region where pre- 

 cipitation is uniform and large, is a stable or- 

 ganization. The sea with its tides, its currents, 

 and its winds in its great entirety is unchange- 

 able. Now and then some heavy storm may 

 pile the driftwood farther into some cove, or 

 sweep bare a projecting point, yet the main 

 tension line between the two is of comparatively 

 great stabilitv. 



As shown in the preceding synopsis, the 

 vegetation of the sea strand is divided with re- 

 ference to the substratum, into two general 

 divisions of; a. vegetation of sandy beaches, and 

 b. vegetation of rockv beaches. 



a. Vegetation of sandy beaches. 

 I . Sand beach formation. 

 a Large open beach. 

 h Small inlet beach. 



Since the sand beaches vary considerably with 

 respect to size, slope and direction, it is natural 

 to expect that the plant formation upon them 

 will likewise vary. In some places the coves or 

 inlets may be wide and open towards the direct- 

 ion from which prevailing winds blow. In such 



