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described in similar terms. The princi[)ul object of tliis map is 

 to show the general distribution and relations of the hard rocks, 

 the surface geology, and the topography. This map, as has 

 Iteen previously explained, affords, even in the absence of 

 contour-lines, a general idea of the relief-features. The out- 

 lines of the principal elevations and depressions are shown in 

 the drumlins and the drainage system ; and the remainder of 

 the surface consists either of the sandplains with the kettles and 

 kames, or of ledges, the isolated remnants of the ancient pene- 

 plain. It thus requires only a little imagination to sec in the 

 map the actual form of the surface. The delineation of the 

 surface features — the drumlins, streams, swamps, etc. — is 

 far from being uniformly accurate. They have been traced out 

 with the greatest care in the northern part of the town, and in 

 general where the country is most open and accessible. Some 

 of the wooded areas, remote from the streets and destitute of 

 land-marks, have been only very imperfectly explored. This 

 is es])eeially true of the large tract of rocky woodland lying 

 between King Street and Scituate Pond in Cohasset and Union 

 Street and Beechwood lliver in Hingham, embracing more 

 than four square miles and crossed by only one road — the 

 most complete wilderness in the Boston Basin outside of the 

 Blue Hills. For many of the names of the hills, streams, and 

 other natural features which appear upon tliis map I am espe- 

 cially indebted to Mr. Edward T. Bouve's most interesting 

 contribution to the town history on the "ancient landmarks" of 

 Hingham and Cohasset. The special maps, having been 

 pi'inted in co-operation with the Town of Hingham and before 

 the plan of this work was fully decided upon, do not agree in 

 scale and topographic detail with the special map of Nantasket, 

 the most notable difference being the absence of contour-lines 

 and the outlines of the swamps and marshes, and the repre- 

 sentation (in black characters) of the actual outcrops, as well 

 as the theoretical distribution (in colors) of the sedimentary 

 and volcanic rocks. These special maps represent the three 



