If the smoke of London were inseparably identified with its commercial greatness, one might willingly resign oneself to the inconvenience. But to every other reason against its continuance must be added as a last one, on the evidence of innumerable competent and disinterested witnesses, that the nuisance, where habitual, is, for the greater part or entirely, voluntary and preventable; that it indicates mismanagement and waste; that the adoption of measures for the universal consumption of smoke, while relieving the metropolis and its population from injury, would conduce to the immediate interest of the individual consumer, as well as to indirect and general economy. For all the smoke that hangs over us is wasted fuel. The consumption of smoke in private houses is unfortunately a matter to which hitherto little attention has been given; and it would be vain to hope that the reform should begin with those, whose individual contributions to the public stock of nuisance are comparatively trifling. With the progress of knowledge on these subjects, a time will undoubtedly arrive, and at no distant period, when chimneys will cease to convey to the atmosphere their present immense freight of fuel that has not been burnt, and of heat that has not been utilised; when each entire house will be uniformly warmed with less expenditure of material than now suffices to its one kitchen fire; and our successors[53] will wonder at the ludicrous ingenuity with which we have so long managed to diffuse our caloric and waste our coal in the directions where they least conduce to the purposes of comfort and utility. [53] To the philosophical thinker there would seem to exist no important difficulty which should prevent the collective warming of many houses in a district by the distribution of heat from a central furnace--perhaps even so, that each house might receive its _ad libitum_ share of ventilation with warmed air. Ingenuity and enterprise, in this country, have accomplished far more arduous tasks; and I little doubt that our next successors will have heat-pipes laid on to their houses, with absence of smoke and immense economy of fuel, on some such general organisation as we now enjoy for gas-lighting and water-supply.--J. S., 1854. But, while the arrangements of private establishments may, perhaps wisely, be left to the operation of this spontaneous reform, I would venture to recommend in regard to furnaces, employed for steam-engines and otherwise for manufactures within the City, that you should endeavour to control the nuisance of smoke.