Scientific amusements . disengaged a gaswhich was a constituent of |water. This gas was subse-quently found to be inflam-mable, but it is to Cavendishthat the real explanation of Ihydrogen is owing. He ex-plained his views in 1766. Hydrogen is obtained in themanner illustrated in the cut,by means of a furnace, as onpage 70, or by the bottlemethod, as per page 71. The Ifirst method is less convenientthan the second. A gun-barrel or fire-proof tube is passed through the furnace, andfilled with iron nails or filings ; a delivery tube is at the 1 1 F^^ Kwi^fti 11 |B W»m ^^^^ S^^H^^siw!^^M JISiJM ^
Scientific amusements . disengaged a gaswhich was a constituent of |water. This gas was subse-quently found to be inflam-mable, but it is to Cavendishthat the real explanation of Ihydrogen is owing. He ex-plained his views in 1766. Hydrogen is obtained in themanner illustrated in the cut,by means of a furnace, as onpage 70, or by the bottlemethod, as per page 71. The Ifirst method is less convenientthan the second. A gun-barrel or fire-proof tube is passed through the furnace, andfilled with iron nails or filings ; a delivery tube is at the 1 1 F^^ Kwi^fti 11 |B W»m ^^^^ S^^H^^siw!^^M JISiJM ^^^S ? 1 1 Magnesium wire burning in oxygen. HYDROGEN. 69 farther end, and a flask of water boiling at the other. Theoxygen combines with the iron in the tube, and thehydrogen passes over. The second method is easilyarranged. A flask, as in the cut, is provided, and in itsome zinc shavings are put. Diluted sulpuric acid is thenpoured upon the metal. Sulphate of zinc is formed in theflask, and the hydrogen passes Extraction of oxygen from air. Hydrogen being the lightest of all known bodies, itsweight is put as i, and thus we are relatively with itenabled to write down the weights of all the otherelements. Hydrogen is fourteen-and-a-half times lighterthan atmospheric air, and would do admirably for the in-flation of balloons were it not so expensive to procure in 70 CHEMISTRY. such large quantities as would be necessary. Ordinarycoal gas, however, contains a great deal of hydrogen, andanswers the same purpose. A very pretty experiment may be made with a bladderfull of hydrogen gas. If a tube be fitted to the bladderalready provided with a stop-cock, and a basin of ordinarysoap-suds be at hand, by dipping the end of the tube in
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