1883. 129 Trans. N. V. Ar. Set. 



of the U. S. Assay Office in Wall street ; its surface is now much dis- 

 colored, and the edges of many of the blocks show cracks. A variety 

 of medium texture was employed in the hotel at the corner of Fulton 

 and Pearl streets, erected in 1823 ; the surface is decomposed, after the 

 exposure of exactly sixty years, with a gray exterior, in a crust yi to 

 X inch in thickness, soft and orange-colored in section. Many crys- 

 tals have fallen out of the surface on the weathered eastern face, pro- 

 ducing a pitted appearance. A very coarse variety has been used in 

 the Bank-building at Thirty-second street and Broadway, in large part 

 being set on edge ; very many of the blocks are more or less cracked, 

 even in the highest story. In the U. S. Treasury building, in Wall 

 street, a rather coarse dolomyte-marble, rich in tremolite and phlog- 

 opite, was used, the blocks being laid on bed m the plinth and most of 

 the ashlar, but largely on edge in the pillars, pilasters, etc. ; in the lat- 

 ter case vertical fissures commonly mark the decay, but even else- 

 where a deep pitting has been produced by the weathering out of the 

 tremolite. The marble used in many other prominent buildings has 

 been improperly laid,^. ^., in both of the buildings of the City Hall, the 

 Drexel building at the corner of Broad and Wall streets, the Academy 

 of Design at 23d street and Fourth avenue, etc. 



Cemetery at Ntiv Utrecht. — Here a very fine white marble is used 

 in many stones, perhaps that of Carrara — a few stones dating about or 

 a little before 1800. These are in excellent condition, but on the 

 east face are much roughened. 



Another variety is a tremolitic dolomyte-marble, white, fine to coarse 

 in texture, probably from Westchester County. It is in fair to good 

 condition, but the weathered tops, sides, and east faces of the stones are 

 in a pulverulent state. Sometimes the west face is the one rough- 

 ened, and the stone is split near it. 



Stones of a white veined marble, probably from Vermont, date from 

 1853 back to 1828. They are in good condition, but the east face is 

 pulverulent. 



A blue marble (C. Groenendyke, 1797) and a black and white marble 

 (N. G., 1795) are in excellent condition, but the eastern faces of the 

 stones are decidedly roughened, the inscriptions remaining sharp and 

 distinct. 



Flatbush Cemetery. — Marble here predominates in two varieties. 

 The stones of a fine white marble (Italian), date from 1859 back to 

 1809. They are generally in good to excellent condition, but their 

 surfaces are more or less roughened, becoming pulverulent when dat- 

 ing from 1836. That of [809 (N. R. C), a horizontal tablet, is black- 

 ened by a minute lichen, lepra antiquitatis (also J. V., 1800). 



