187 



one fourtli of a mile of" the Home Meadows, a salt marsh which 

 is virtually a southwai'd continuation of the harbor, it is 

 al)rupt)y deflected to the eastward by the ridge of modified drift 

 along East Street, a spur from the Lower Plain, and pours its 

 waters over the granite ledges into Weir Kiver Bay. The 

 facts concerning- this very clear case of diverted drainage will 

 be more fully presented in the section on the surface geology. 

 Not only the streams, but also tiie areas of obstructed 

 drainage, tlie ponds, swamps, and marshes, have been traced out 

 with considerable care ; and all these features, so far as the 

 scale will permit, are delineated with approximate but not 

 uniform accuracy on the general map. With the exception of 

 Accord Pond, whicli belongs only in part to Ilingham and is 

 beyond the limits of the map, the larger ponds, including 

 Trii»hanuner, Fulling JMill, Gushing, and Foundry Ponds, are 

 all artificial, originating in the construction of dams at favor- 

 able points across Weir Kiver or its tributaries. Hound Pond, 

 on the lower part of Fresh River, is also a mill-pond. Accord 

 Pond, the principal source of the water supply for liingham 

 and Hull, and 135 feet above the sea, owes its existence to the 

 sand[)lain and connecting esker which form a natural dam 

 directly across the valley in which the pond lies. The swamps, 

 which often represent ponds in course of extinction, still 

 ejnbrace occasional limited sheets of water ; and kettle-ponds, 

 or ponds occupying the deeper hollows in the modified drift, 

 are fairly common in some districts, especially over the broad 

 area of modified drift west of Weir liiver. Some of these are 

 too small for accurate representation on the map, and the 

 majority are wet-weather ponds only. The swamps and 

 marshes represented on the map require no s[)ecial description. 

 At the lower end of every fresh-water marsh or swamp there is 

 an obvious obstruction, usually of modified drift, rarely ledges. 

 The feeble and sluggish character of the streams is seen in the 

 little progress they have made in trenching these drift barriers. 

 An occasional swamp crosses a low water-parting and drains in 



