On the Heights of the Tides of the Atlantic Coast. 51 
for its northeastern entrance. The form of the shore is less fa- 
at Provincetown. At Cape Ann they are nearly of this same 
height and increase in passing up and into the bay to 10-0 feet 
at on and 10-1 feet at Plymouth. 
The height at Newburyport is probably local, depending upon 
the position of the tide-gauge. ‘There is but little change from 
cae to Portland, and from Cape Sable to Ellenwood’s 
nd, 
ing of the waters into this greater bay? If so, why are net the 
heights of Cape Breton greater than those of Nova Scotia? 
Fundy, and the rise increases with extraordinary rapidity. 
Complicated character of the cotidal lines in this imme 
