Proceedings Am. Philos. Soc. Vol. LV. 



Plate X 



Fig. I. Tall salt grass, Spartina (/labra. fringing salt marsh at Cold 

 Spring Harbor, Long Island, August, 1914. 



Fk;. 2. Surface of salt marsh at Nantucket, Massachusetts, billowed by 

 the wind, August, 1914. 



