Great, however, as the economic results of the gas-producer have been, its inventor looked forward to still more remarkable applications of it. In 1882 he told the British Association, in his presidential address, that he thought “the time is not far distant when both rich and poor will largely resort to gas as the most convenient, the cleanest, and the cheapest of heating agents, and when raw coal will be seen only at the colliery or the gas-works. In all cases where the town to be supplied is within, say, thirty miles of the colliery, the gas-works may with advantage be planted at the mouth, or, still better, at the bottom of the pit, whereby all haulage of fuel would be avoided, and the gas, in its ascent from the bottom of the colliery, would acquire an onward pressure sufficient probably to impel it to its destination. The possibility of transporting combustible gas through pipes for such a distance has been proved at Pittsburg, where natural gas from the oil district is used in large quantities.” It may be well to point out here that as a step towards this, it was a favorite project of his—practically carried out in some places—to divide the gaseous products of the ordinary distillation of coal into two, the middle portions being illuminating gas of 18 to 20 candle power instead of 16, and the first and last portions, which under this system may be largely increased, being heating gas; such gas he expected to see sold at 1_s._ per 1,000 cubic feet. The obvious and only practicable objection to the plan is the necessity for doubling all the mains and service-pipes. That we shall eventually burn gaseous fuel on the domestic hearth, as we have lately learnt to do on the metallurgical, I have not the smallest doubt; it is a mere question of the time necessary for the education of the public mind upon the question; the apter the pupil, the more speedy will be the desired result. Let it be thoroughly understood by every one that the soot which hangs in a pall over London in a single day is _equivalent to at least fifty tons of coal_, and then there will be no difficulty in seeing that the true and the only remedy for our London fogs, with all their attendant ills, is—gaseous fuel. May we not hope that, though Sir William Siemens has gone from among us, the great movement for smoke abatement, in which he so earnestly labored during the last three years of his life, may have full effect?