BURNING AND APPLYING GAS.—J. Whi-chord, and S. E. Rosser, of London, patentees. This invention consists; firstly, in an improvement in the mode of burning and applying gas for lighting. This is effected by the introduction ot a ventilating bell and tube, placed in a convenient and suitable position above the gas-burner. These are made with a trough or channel, to receive the condensation of any aqueous vapors arising Jrom the combustion of the gases -, the said trough or channel being so placed that the aqueuus products can either be carried away by a pipe {or other means) or become evaporated, and driven off through the chimney when the gas is burning. Secondly, in effecting such an arrangement of the globes, glasses, and chimneys of gas burners, as to introduce a current of cold air between the external surface of the ventilating bell or glass, and the interior ot the globe which encloses the gas-burner; and also a second current! between, the external surtace of the gas-chimney and the inner surface of the ventilating glass or bell. In this arrangement the pendent glass or bell above the burner dips down below the mouth of the surrounding globe, and at the same time descends externally below the upper orifice of the chimney of the gas-burner. By this means the atmospheric air, which can only enter at the top of the globe, is made to descend between the inner surface of the globe and the outer surface of the pendent bell, carrying with it the whole of the products ot the combustion of the gas up the ventilating tube. Thirdly, in an improved mode of applying gas for heating purposes. The gas burner of a stove is, in this case, placed within or under a tube or casing for conveying the heat through a chamber surrounded with water or other fluid. This chamber or casing is made with a trough or channel placed in a suitable position for conveying off the condensed aqueous vapors that may be formed inside the chamber by the combustion of the gases, and is so placed, that the aqueous products can be either carried away by a pipe, (or other means) or become again evaporated and carried up through the chimney. The tube or casing may be made similar to the worm of a still or refrigerator, and have its end turned down to carry the aqueous products off into a vessel placed to receive them. SMELTING METALLIC ORES.—T. B. Smith, of Bristol (England) patentee.—This invention has reference more particularly to the first operation in smelting sulphuret copper, and other ores; namely, their calcination, by which a portion ot the sulphur is expelled, and the metals they contain are oxidized.— The inventor proposes to avoid the inconvenience and injury of the ordinary process caused by allowing the free vapors to pass into the open air; and, by condensing the gases which are evolved in the process in flues or pipes, to use the sulphurous vapors for the manufacture of sulphuric acid. For these purposes he uses nearly closed chambers, furnaces, or retorts, which are heated from without, and by passing heated air into these he does not admit the products of combustion from the fire to mix with the vapors or gases evolved in the process of calcination, as such products would render these vapors unfit for the manufacture of sulphuric acid. With the chamber, furnace, or retort employed, he connects suitable flues or pipes, to carry away the vapors, in which he condenses the vola-tized metals, while the sulphurous vapors are carried away to suitable chambers, and proceeded with in the ordinary manner of obtaining sulphuric acid from them. When sulphuric acid is not needed, the process of calcination may be much facilitated, by introducing a much larger quantity of air, which will be an advantage to the smelters. The inventor also proposes to use a portion of heated oxygenated air at times, to assist the calcination of metallic ores. [Condensed and selected from the a London Mechanics Magazine.”