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The marvellously cheap "water-gas" which is made through a jet of steam impinging upon incandescent carbons or upon other suitable glowing hot materials will, no doubt, for a long time command the market after the date at which coal-gas for the generation of power has been partially superseded.

"Force superheated steam," replied the spirit, "through an intensely heated substance, as you now do in making water-gas preferably platinum heated by electricity apply an apergetic shock, and the oxygen and hydrogen will separate like oil and water, the oxygen being so much the heavier.

Johnstone Stoney pointed out in 1867 prohibits the supposition that bodies of insignificant gravitative power can possess aerial envelopes. Even our moon, it is calculated, could not permanently hold back the particles of oxygen, nitrogen, or water-gas from escaping into infinite space; still less, a globe one thousand times smaller.

Some brief repetition may not here be amiss as to the products of volcanic action, of which so much has been said in the preceding pages, especially as many of the terms are to some extent technical in character. The most abundant of these substances is steam or water-gas, which, as we have seen, issues in prodigious quantities during every eruption.

But it seems exceedingly probable that a compromise will ultimately be effected between the methods adopted for making water-gas and calcium carbide respectively, the electric current being employed to keep the carbons incandescent.

Watch was seen no more in the sanctum for a week, and my three dollars carried on the concern. When he returned, he generously gave me a dollar, and said that he had spoken of me to the Water-Gas Company as a capital secretary. Then he wrote me a pass for the Arch Street Theatre, and told me, benevolently, to go off and rest that night.

At their Acclimatarium in West Philadelphia, including the old Centennial Grounds of '76, and the Zoological Garden, munificent arrangements have been made, by the use of glass, wood, iron, and water-gas heating apparatus, for the creation of an artificial tropical and sub-tropical climate.

Moreover, just about the time that Edison took up incandescent lighting, water-gas was being introduced on a large scale as a commercial illuminant that could be produced at a much lower cost than coal-gas.

We see here, then, the means to which he resorts oxygen, and either coal-gas or water-gas , or pure hydrogen, for producing heat, and the blowpipe for the purpose of impelling the heated current upon the metals. I have two or three rough drawings here, representing the kind of furnaces which he employs. They are larger, however, than the actual furnaces he uses.

So it happened that my news paragraphs, sometimes pointedly turned into a reflection, crept into the editorial columns, when water-gas was lively. Venturing more and more, the clipper finally indited a leader; and Mr. Watch, whose nose water-gas was reddening, applauded me, and told me in his sublime way, that, as a special favor, I might write all the leaders the next night. Mr.