# MINING, QUARRYING, METALLURGY, AND MINERAL PRODUCTS. [ 1 1 . Aaron, E. & W., Liverpool.—1. Halkyn hydraulic limestone. 2. Halkyn Chirt stone. 3. Holywell Roman cement stone. [ 2 ] Aberdare Coal Company, Cardiff, Glamorganshire.—Specimens of Aberdare Company’s Merthyr steam coal, from the four-feet and nine-feet seams. Tho coal*, raised by this company, and shipped at Cardiff, are used extensively for marine purposes by the English and French Governments, and are entered in the naval contract* of both countries. They are also very largely used, by all the great Bteam navigation com panies in England, and on the Continent. [ 3 ] Aberdare Iron Company, Aberdare, Glamorganshire.—Coal; iron ore, pigs, refined metal, and railway iron. [ 4 ] Aberdare Steam Fuel Company (Limited), White Lion Court, London; Cardiff, and Aberdare.—Patent steam fuel. Evaporative power 15-852 Specific gravity 1-323 Coke 8G-8 Moisture •93 Frangibility 86-4 13-6 Ash 1-90 Carbon 89-33 Hydrogen 4-23 Nitrogen 1-57 Sulphur •G7 Oxygen ... 1-GO The Aberdare Patent Steam Feel, is made by compressing the small of the best South Wales steam coal, until its density somewhat exceeds that of the coal itself. From the regular form, and uniform size of the blocks, a larger quantity by weight can be stowed in a given space, to the extent of one-third, than of the coal; and at the same time the evaporating power is main tained ; facility in firing is in no degree diminished; all risk of spontaneous ignition is removed; and much advantage is gained in convenience and cleanliness of trans-shipment, especially in foreign ports. Moreover, while coal, when stored abroad, is subject to a deprecia tion of from 20 to 30 per cent., this fuel is absolutely incapable of injury, even by a lengthened exposure to the full effects of tropical heat and rain. Weight, per cubic foot, 80 lbs. Space occupied by one ton, 28 cubic feet. Supplied in blocks 9 in. by 6 in. square, of 14 lbs. each. [ S ] Adair, John G., Bellgrove, Ballybrittas.—Coal from exhibitor’s collier} 7 , Ballylehane, Queen’s County, Ireland. Marbles, minerals, and building materials, natural productions of County Donegal, Ireland. [ 6 ] Aytoun, Robert, 3 Fettis Bow, Edinburgh.—Safety-cage for miners, and hoist. Class I. ( 1 ) B