404 BOTANICAL GAZETTE [DECEMBER 
points along the coast from New Hampshire to Florida. The 
results of these surveys show that such favorable conditions occur 
abundantly along the entire coast. Differences of level in the 
high tide of the two contrasted water bodies amounting to nearly 
a meter were found, and from other surveys farther north it is 
known that still greater differences occur. 
That such local changes of high tide level have occurred in the 
past is equally evident. At Scituate near Boston, the storm of 
1898 made a large opening in a barrier beach which formerly nearly 

Fic. 9.—Trees killed by local rise of high tide, near Scituate, Mass., giving 
fictitious appearance of coastal subsidence. 
closed the mouth of a small bay. The high tide level immediately 
rose, according to the inhabitants, more than half a meter, and 
extensive areas of growing trees were invaded by salt water, the 
trees now standing erect but dead (fig. 9). Dikes built to reclaim 
portions of the former marsh surface are overflowed by the tides, 
and the marsh is building up to the new level. 
In 1811 a break ina barrier beach a short distance to the south 
is said to have resulted in the death of many trees, the stumps of 
which have recently been extracted from the shallow shoreward 
portion of the marsh. At Cascumpeque Harbor, Prince Edwat 

