[J. Thomas Scharf (1886)] tremolite, cubical and octahedral crystals of iron pyrite, asbestos, calcite and poor specimens of mal-achite and azurite. There are two very interesting dykes of granite to be seen in these quarries; one of them is from two to eight feet broad, with sharp, well-defined margins. The Silver and Copper-Minks ok Sim; Sim; AND Sparta. — There are several perpendicular and horizontal shafts in and about Sing Sing, which de-serve a fuller description than has been given in Bol-ton's " History of the County of Westchester." Less than half a page is devoted to them.1 At page 509 he incidentally mentions Colonel.lames, "director of the silver-mines in this place," as having command of a regiment, in the year 1774, which was stationed at Sing Sing, which, upon the breaking out of hostilities, was ordered to Boston. "The silver-mine" is located within a few yards of the north wall of the prison. The shaft remained open until within a lew years of the present time, when it was covered by a branch track of the railroad which passes into the prison-yard. This shaft was about one hundred and tweuty feet in extent. The mine was first worked by an English company, as we are told, with considerable success. A smelting fur-nace was erected near the outlet of the Sing Sing Kill. There the ore was reduced and the silver made into ingots for exportation to England.