48 BOTANICAL GAZETTE [JANUARY 
their seaward hollows swamps and ponds, which are at times — 
flooded by the tide. In the third of these amphitheaters (fig. 2) _ : 
many slabs of peat may be seen, which have probably been washed 
inland from the ledge below tide line. 
Across the cape extends the long dune upon which stands the 
Henlopen Light. This is the largest dune in the region, estimated 
ten years ago to be 80-90 ft., when the crest was at the lighthouse. 
By 1911 the summit had moved about 300 ft. to the southwest, and 
Fic. 2.—View from the crest of the lighthouse dune, looking south over the third 
aeipshithentes; flooded area in the distance. 
appeared to be several feet higher than the base of the lighthouse. 
This advance has not changed the general appearance of the region, 
as photographs taken from the same points on both visits are 
very nearly identical. In spite of the fact that this is an active 
dune, a small clump of Ammo phila has managed to gain a foothold 
on the crest (fig. 4). 
The appearance of the cape after ten years is apparently 
unchanged. A low beach extends around the point, bordered on 
the inner side by low dunes, which inclose a complex of dunes and 
