Magnetism in the United States. 13 



TABLE I—CONTINCEB. 



Locality^ Geology^ and remarks, 



18. In the yard of the magnetic observatory, at Girard College, Philadelphia. ^ 

 " To the northward and eastward of the college, within the enclosure, and in the 



road in the rear of the smaller building next to the college. Metamorphic rock, 

 below gravel, etc. 



19. About 10 miles west of Philad., and 250 yards E.S.E. of the trigonometrical station. 



80. Near Woodbury, N. J. Marl and greensand of the cretaceous formation. 



81. Entrance to Little Egg Harbor, N. J,, northwestern point of island. Alluvium 

 and white sand. 



83. Delaware. A hill IJ niile W.N.W. of the town hall. Trap, covered with red 

 clay. Local attraction. 



84. Three miles south of "Wilmington, Del. At the edge of the tertiary formation, 

 no rocks or boulders apparent. 



85. New Jersey, on the Delaware river. Drift. Local attraction ascertained to 

 exist, by partial observations at three localities. 



86. Peapatch Island, Delaware river. Alluvial mud at least 10 feet deep. 



81. Near Roadstown, N.J. Cretaceous formation. Ferruginous sandstone in vicinity. 



88. An isolated hill near Greenwich, N. J. Cretaceous ; nnmagnetic iron ore. 



89. About 60 yards E.S.E, of the light-house. Alluvial clay and sand. 



90. New Jersey. Cretaceous marl and sand. 



01. Delaware Bay, 60 yards S. by W. of light -house. Cretaceous marl and sand. 



92. At Price's, near Cape May. Cretaceous marl and sand. 



93. Seventy yards S-E. of light-house. Cretaceous marl and sand. 



** About IGO yards west of the liglit-house, near the sand dunes. Quarts, sand, 

 and broken shells- 



94. Near Cape Henlopen. 



95. On Cape Henlopen. Clay and sand. 



96. Near Abingdon, Maryland. Talcose slate and hornblenJe. 



97. A short distance to N.W. of light-house, at the mouth of the Susquehanna river. 



Ferruginous clay and sand. 

 98 I ^^ ^^^ ^''^» ^^^ property of L. B. Finlay, 9 miles north of Baltimore, on the 

 ' ) Harford turnpike. Metamorphic rocks, underlying gravel and sand. 



99. Chesapeake Bay, near the dwelling of P. Wethered, on the upper island- Allu- 

 vial clay and sand. 



100. On Prospect Hill, five miles from Baltimore, north of the old Frederick road. 



Alluvial clay and sand. 



101. Baltimore harbor; between the hospital and western stable. Ferruginous 

 sand and clay. 



102 I S^^^*^^^ *^^ ^^*> l^g^ts at the mouth of the Patapsco river. Ferruginous 

 J sand and clay. 



103. Twenty yards S,S.E. from light-house. Ferruginous sand and clay. 



104. North end of Kent Island. Chesapeake Bay. Ferruginous sand and clay. 



105. On the west shore of Kent Island, opposite Thomas' Point, twenty-one yards 

 north of monument. Ferruginous sand and clay. 



106 I ^" '^^ north side of Severn river, opposite Annapolis, Maryland. Ferrugin- 

 ' ) ous sand and clay- ' 



107 [ A prominent hill near West river, Maryland, the property of Bushrod Mar- 

 ' ) nott. Greensand formation, ferruginous clay and marl. 



108. Anne Arundel county, Marylauil, near the Annapolis railroad, 12 miles from 

 Annapolis. Greensand formation, ferruginous clay and marl. 



109. Fnnce George's county, Md., 14 miles from Washington City, on the old Co- 

 lumbia road; property of J. B. DoMms. Talcose «late. 



110. Prince George's Co., Md., G miles east of Wash'n City. Ferruginous clay and sand. 



111. Near Georgetown, D.C., 122 yards west of the geodetic elation, in the grounds of 

 J. H. Causten. Mica slate with quartz veins, underlying ferruginotis clay and gravel. 



« At the geodetic station. 1° lO-'S in September, and 1° 02''0 in October, by 



two different instruments. 

 ■* Same station as in June, 1S51. 



