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SCIENCE NOTES.

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SCIENCE NOTES. A SIMPLE and handy generator of formic aldehyde, the well-known disinfectant, is now supplied by the Commission Universelle, Paris. VOLCANIC dust carried by the wind from the moun- tains of Puy in Auvergne enriches the soil of Limagne with phosphoric acid and potash. Ac- cording to M. Nivois, Inspector-General of Mines in France, it is owing to this natural fertiliser that the soil is so rich. A field at Gerzat, Clermont-Ferrand, has yielded a fine crap of hemp 18 years running without any other manure. A REMARKABLE fossil plant has been added to the New York State Museum. It was found by Mr. J. N. Nevius, of the museum staff, in thin blue sand- stones, near Monroe, Orange County, New York. It is a trunk 12ft. long and 11 to 15in. thick, with stumps of branches. Apparently, it is the fossil of a gigantic seaweed, but this point has not been settled 11 yet. The sandstones are evidently older than the coal measures. THE Paris-Lyons-Mediterranean Railway tried an electric locomotive of grande vitesse." The energy is derived from accumulators, and amounts to 611 horse-power. The engine drew 100 tons at a speed of nearly 70 miles an hour. Further improvements of it are in progress. ACCORDING to MM. Biandbini and Regnault, the inventors of the phonendoscope, by which the size and position of the internal organs is outlined on the skin, a Turkish bath causes the heart, lungs, liver, and kidneys to dilate with the dry heat and return to their normal size in the cold water. This action appears to their mind salutary. THB Engineer is publishing a series of articles by Mr. Charles Bright, F.R.S.E., the well-known electrical engineer, on "coast telegraphic communi- cation," in which he describes the various methods of telegraphing with lighthouses and lightships, &c. Owing to the swinging of the ship with the tides, it is difficult to employ cables, and the wireless tele- graph has now come to the rescue. ACCORDING to Dr. Johannis Horowitz (Vienna cor- respondent of the New York Times), the Austrian inventor Szczepanik has had another bright idea. He causes two trains approaching each other on the same line to stop one another. This is done by the ultra-violet rays of their lamps acting on electric apparatus which they carry (perhaps by precipitating electric sparks). The electric apparatus works the automatic brakes. A "COUVEUSB" cradle, that is to say, a "baby- hatcher" for fostering new-born babies, after the manner of incubators for chickens, has (says the Globe) been introduced by Dr. Diffre, Montpellier, France. It is a copper cradle, closed by a moveable plate of glass and warmed underneath by a boiler of warm water heated with an oil lamp. The cradle contains a bed, a moist sponge to make the air humid, and a thermometer to show the temperature. There are two holes for ventilation. Dr. Budin, member of the Academic de Medicine, speaks highly of the invention. AT the recent meeting of the Academic des Sciences, Paris, M. M&rey presented a new phono- graph which speaks so distinctly that one can scarcely recognise any difference between the original voice and its reproduction. On the same occasion, M. Dussand described a new method of amplifying 9 the sounds of the phonograph just as a photograph is enlarged. It is done by causing the phonograph to speak into a second phonograph having a cyclinder of larger diameter. Evidently we are slowly advanc- ing towards the perfection and development of this marvellous instrument. Aw aqueous solution of ammonium borate, accord- ing to a recent German patent, will render articles made of plaster of Paris hard and insoluble in water. The hardening liquid may either be mingled with the plaster in the act of moulding, or it may be applied on the surface of the finished casts with a brush. The solution is prepared by dissolving boracic acid in warm water, and adding thereto sufficient ammonia to form the borate, which remains in solution. THE use of smokeless powder has its disadvantages, especially the increased wear of the gun. It is rather a grave inconvenience, for in time of peace soldiers have to practice firing, and their arms are the worse for it. Professor W. C. Roberts-Austin, C.B., has recently presented photographs to the Iron and Steel Institute which demonstrate the ruin of rifled ordnance by cordite, melinite, and other smokeless powders. A quick-firing gun suffered from cordite after five shots, although the steel was of the usual quality and the tube had been tempered in oil. M. Meriel, a French writer, thinks that if the sudden elevation of temperature followed by cooling on firing a shot could be avoided it would help the matter. The Times correspondent in Zurich writes that a Volta commemoration is to be held in May next at Como, where the great electrician was born, and where he died in 1827. The fetes at Como are to celebrate the centenary of Volta's discovery of the electric pile, in honour of which event an exhibition of inventions in electricity will be opened on May 14, the town contributing some 500,000 francs to the preliminary expenses. Como has always been proud of its greatest citizen, and Volta's memorials are care- fully preserved in its Museo Civico, where can be seen his first electric pile, many of his scientific instru- ments, an electric pistol, and an electric lamp of his in- vention, besides many of his manuscripts, sketches, and designs. HOUSEHOLDERS owe some gratitude to Professor R. W. Wood, of the University of Wisconsin, for I showing that frozen water pipes can be thawca Dy sending an electric current of sufficient strength through them. In one experiment 300ft. of a frozen service pipe between the main and a house was treated, the current passing between a wire attached to the pipe in a cellar and another wire connected to a faucet across the street. Twenty minutes after the pipe was heated to 60 degrees-there was a full head of water in the cellar. This method is less dangerous than applying hot coals, but, nevertheless, it requires a skilled person, for a weak part of the pipe might fuse with the current. It is, of course, the resistance of the iron pipe to the passage of the current which generates the beat. A Nsw electric wave indicator has been discovered by A. Neugschwender. The silver coating of a mirror is slightly scratched, and the mirror put in circuit with a Daniell cell and a galvanometer. On breath- ing upon the mirror, the condensed vapour bridges the gap in the silver coating and the galvanometer shows a deflection, which, however, is immediately annulled when electric waves impinge upon the mirror. When a piece of moistened cloth is fixed near the latter, the action is rendered continuous. The width of the gap in the silver coating must be Sufficiently wide that no ordinary coherer action intervenes. The experiment can be carried out with copper or tin as a mirror metal, and with glass, mica, celluloid, caoutchoue, stearine, or pitch as a support. Ammonia, hydro- chloric acid, and various salt solutions may be em- ployed. Sound vibrations, concussions, statical charges, and simple heating are without effect, though every spark discharge is responded to so ve though every spark discharge is responded to so rapidly that the individual discharges of an in- duction coil are separately indicated, as may be proved by inserting a telephone in the detector circuit. ELECTRIC lamps with filaments of carbide of sili- con are now (observes Work) being introduced as a result of experiments for the purpose of increasing the efficiency of an incandescent lamp by having the filament of a material capable of remaining solid and rigid at a higher temperature than is possible with carbon. Cellulose is treated with sulphuric acid or together with phosphoric acid, and a gelatinous, semi-liquid substance is obtained with which powdered amorphous silicon is incorporated by mechanical mixture. This powder is prepared by a special process, the ordinary material sold as amorphous silicon not being suitable. The semi- liquid mass, after being freed from air, is pressed through a fine aperture from which it issues as a continuous thread, which, passing through alcohol into water, hardens in the way common to all cellu- lose processes. The thread is washed and wound on frames to dry, after which it is carbonised; the flla- ments are then flashed in a vapour of silicon and carbon, these elements being precipitated upon the thread. The usual faults of glow lamps, those of thread. The usual faults of glow lamps, those of falling off in the light and blackening the bulbs, are said to be absent from the carbide of silicon lamp. I The inventor, Herr Langhaus, claims that the lamp, 8tarting at an efficiency of 2'8 watts per amy-acetate candle (about 3'1 watts per English candle), will run for 600 to 800 hours without any material decrease in the light emitted, and without increase in the con- sumption of watts per candle.

LITERARY EXTRACTS.

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GREATER BRITAIN.

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READINGS FOR THE YOUNG.,

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THE WOMAN'S WORLD.

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