Trmis. N. Y. Ac. Set. 72 Jc-^^- 29. 



Brownstone, from Bdleville and the base of the Pal sades, N. J. 



Bluestone and " mountain graywacke,'' from the Hudson River. 



Limestone, from Mott Haven and Greenwich, Conn. 



Granyte, from RadclifTe's Island, etc.. Me. 



Gneiss, from New York, Westchester and Kings counties, N. Y, 



Marble, from Westchester county, N. Y. 



The fortifications in the Harbor and entrance to the Sound, con- 

 structed of granyte from Dix Island, Spruce Head, etc.. Me., gneiss 

 from the vicinity, brownstone from Conn., etc. 



The stonework of the New York and Brooklyn Bridge, as I am kindly 

 informed by Mr. F. CoUingwood, the engineer in charge of the New 

 York Approach, is constructed oi»the following materials : 



Granyte, from Frankfort, Spruce Head, Hurricane Island, East Blue 

 Hill, and Mt. Desert, Me., Concord, N. H., Cape Ann, Mass., Westerly, 

 R. I., Stony Creek, Conn., and Charlottesburg, N. J. 



Limestone, from Rondoul and Kingston, N. Y., also from Isle La 

 Motte and Willsboro Point, Lake Champlain, and vicinity of Catskill, 

 N. Y. 



In the Anchorages, the corner-stones, exterior of the cornice and coping, 

 and the stones resting on anchor-plates, consist of granyte from Char- 

 lottesburg and Stony Creek, in the New York Anchorage, and from 

 Westerly, in the Brooklyn Anchorage. The rest of the material is entirely 

 limestone, mainly from Rondout, largely from Lake Champlain. In the 

 Towers, limestone was chiefly employed below the water li.ie, and, abcve, 

 granyte from all the localities named, except Charlottesburg, Westerly 

 and Stony Creek. In the Approaches, the materials were arranged in 

 about the same way as in the Towers. Additional particulars aie 

 given concerning the quantity, prices, tests of strength and reasons for 

 selection of the varieties of stone. 



For roofing, slate is largely employed throughout these cities, being 

 mainly derived from Poultney, Castleton, Fairhaven, etc., Vt., and Slat- 

 ington, Lynnport, Bethlehem, etc., Penn. 



For pavements, the boulders of trap and granyte from excavations 

 have been widely used in the "cobbletone" pavements. The 

 trap (or diabase) of the Palisades across the Hudson, immedi- 

 ately opposite New York City, and from Graniteville, Staten Island, is 

 used in the " Russ" and Belgian pavement ; also, granyte from the 

 Highlands of the Hudson, from Maine, etc., in the "granite block" 

 pavement in both New York and Brooklyn ; large quantities of crushed 

 trap from Weehawken and Graniteville, for the macadamized streets 

 and roads in the Parks ?nd outskirts ; and also wood, concrete and as- 

 phalt in various combinations. 



