88 J. D. Dana on the origin of some of the 



sin, the valley of Pine -Marsh Creek and the borders of the bay are 

 from approximate measurements, by means of a hand-level, by the 

 author. The rest are from the large map of the city, published in 

 1858, from surveys and drawings by Mr. S. W. Searl. The distances 

 from Oyster Point given are differences of latitude, or northings, in 

 statute miles, and are derived from published maps. In reckoning 

 the heights mean-tide level is taken as the base. The heights are not 

 given of such parts of the terrace or plain as are obviously below the 

 true or normal level (owing to river or tidal currents, or other causes), 

 a fact generally made manifest by neighboring portions being at their 

 full elevation. 



I. Height of the surface along a nearly north-and-south course 

 through the middle portion of the New Haven plain, from Oyster 

 Point, by the College Square, to the Beaver Pond Meadows, and 

 thence, half a mile to the eastward along the valley of Pine-Marsh 

 Creek, (or as it is sometimes called Pine-Swamp brook). 



Northings from Oyster Point. Height of Terrace. 



Oyster Point miles 



In line with id., w. of West R. " 



N. of Oyster Point 0-50 " 



Halleck's Place, S. side* 075 " 



" " N. side 0-87 « 



College St., front of S. College 1-85 " 



York Street, corner of Broadway ^'00 " 



Beaver Pond basin, S. end 270 " 



Id., E. end of Munson street Creek 2-80 " 



Id., W. end of Munson street 2-80 " 



Id., outlet, W. side 3-40 " 



Id., opposite outlet, on E. side 3*40 " 



Id., farther north, E. side 3-65 " 



Id., farther north, at road crossing 3*80 " 



P. M. Creek valley, at southwest point 3-80 " 



Id. at road crossing, N. W. of VV. end Mill Rock 4-20 " 



Id., farther north 4-30 " 



Id., S. E. of Hamden Church 4-55 " 



Id., at mouth of Creek 5-15 " 



* The reader is advised to put a letter H on the map (p. 44) three-sLxteenths of an 

 inch north of the letter 0, west of the harbor, and the letters Gr P on the point of land 

 between the mouths of Mill River and the Quinnipiac. 



