Is electricity to supersede gas altogether? By no means, for gas is destined to play a more important part in the future than it has done in the past. Following close upon the revolution in the production of light comes a revolution in the production of heat for purposes of warming and cooking, and for the production of power. Gas in the future will be largely used not necessarily as an illuminant, but as a fuel and a power producer. When gas is burned in an ordinary gas flame, ninety-five per cent. of the gas is consumed in producing heat, and the remaining five per cent. only in producing light. Gas is far more efficient than raw coal as a heating agent; and it is also far cheaper to turn coal into gas and use the gas in a gas-engine, than to burn the coal directly under the boiler of a steam-engine; for gas-engines are far more economical than steam-engines. Bearing these facts in mind, it cannot but be seen that the time is not far distant when, both by rich and poor, gas will be used as the cheapest, most cleanly, and most convenient means for heating and cooking, and raw coal need not enter our houses; also that gas-engines must sooner or later supersede steam-engines, and gas thus be used for driving the machine that produces the electricity. In the case of towns distant not more than, say, fifty miles from a coal-field, the gas-works could with advantage be placed at the colliery, the gas being conveyed to its destination in pipes. Thus, coal need no longer be seen, except at the colliery and the gas-works. With the substitution of gas for coal, as a fuel, will end the present abominable and wasteful production of smoke. When smoke, ‘blacks,’ and noxious gases are thus done away with, life in our most populous towns may become a real pleasure. Trees, grass, and flowers will flourish, and architecture be seen in all its beauty. Personal comfort will be greatly enhanced by the absence of smuts, ‘pea-soup’ fogs, and noxious fumes; and monuments, public buildings, and pictures saved from premature destruction. The present method of open fires is dirty, troublesome, wasteful, and extravagant. With the introduction of gas as a heating agent, there will be no more carting about of coals and ashes, and no more troublesome lighting of fires with wood, paper, and matches. No more coal-scuttles, no more smoky chimneys, no more chimney-sweeps! On the other hand, the old open coal-fire is cheerful, ‘pokable,’ and conducive to ventilation; while the Englishman loves to stand in front of it and toast himself. All this, however, may still be secured in the gas stoves of the future, as any one could easily have satisfied himself at the recent Smoke Abatement Exhibition in London. The gas stove of the future must be an open radiating stove, and not a closed stove, which warms the air by conduction and convection chiefly, and renders the air of a room dry and uncomfortable.