of Boston and its Vicinity. 215 



V. Large rolled fragmeuts of Oraaite, Quartz, Greenstone, 

 Grreyvvacke, and Argillite occur in and upon this alluvion ; and 

 it is variegated with large ponds of fresh water. Charles river 

 holds the principal part of its course, in the compass of the pres- 

 ent observations, through alluvial soil; the banks of all the riv- 

 ers are alluvial, and though rocky masses sometimes break through 

 it, they never form the channel, through which the waters run, for 



any considerable extent. 



VI. There does not appear to be much variation in the constit- 

 uents of the well-water in this vicinity. The water from the well 

 on Long Wharf gives indications of Muriate of Soda, and Sul- 

 phate of Lime ; that from the well on Beacon Hill, near the State 

 House, affords the same indications, as do the waters from sever- 

 al other wells which we have examined. Several springs con- 



taining small portions of Carbonate of Iron, are found in this ne 

 bourhood, particularly at Brighton, Watertown, and Danve 

 and one in Hingham near Nantasket Beach, within 100 feet 

 the waters of the Atlantic. 



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