The St. Lawrence and Jefferson county hematites were represented by large specimens of ore and by a series of associated rocks and minerals, including some beautiful specimens of millerite, chalcedite, etc. These hematites are mined in a belt about thirty miles long reaching from Philadelphia, Jefferson county, into Hermon, St. Lawrence county. They are known as the Antwerp red hematites, and, being very easily smelted, are mixed with more refractory ores. The Clinton or fossil ores extend in a belt across the central part of the State and are mined in the vicinity of Clinton, Oneida county, and in Ontario and Wayne counties. The limonites shown from Dutchess and Columbia counties included some fine specimens of stalactitic ore. Carbonate ores were shown from Columbia and Ulster counties, where there are extensive deposits on both sides of the Hudson river. MAGNETIC SEPARATOR A feature of the iron ore exhibit was a magnetic separator supplied by the Wetherill Separator Company, of New York. This was kept at work on the magnetite ores from Mineville, and was of great interest not only in showing the method of concentrating the magnetic ore, but also in saving the phosphorus which occurs in the form of the mineral apatite and which is of considerable value in the manufacture of fertilizers. A large quantity of ore was donated for this purpose by Messrs. Witherbee, Sherman & Company. LEAD Lead, generally associated with zinc and sometimes copper, has been mined on a small scale from very early times in Ulster and Sullivan counties, and more recently in St. Lawrence county. Many other localities have yielded small quantities of these minerals. A set of specimens was exhibited by the Ellenville Zinc Company, consisting of strikingly beautiful crystalline masses of quartz galina, sphalerite and chalcopyrite and specimens of the rare mineral, brookite. There was also shown in the same case concentrates from the Ellenville mine of lead, zinc and copper made both by jigging and by magnetic separation, and a collection of ores and associated minerals and rocks from Rossie and Wurtzboro. NON-METALLIC MINERALS A large part of this exhibit consisted of construction materials, stone, slate, brick, tiling and cement. Most of the building stone was exhibited in the form of ten-inch cubes arranged on three pyramidal stands. Only a few of these were especially collected for this Exposition. Many more which were considered desirable could not be obtained in time on account of the inclement weather conditions of the preceding winter. GRANITES