notice-board, bearing, still dimly visible, the words, "Beware of the trains," half hidden by splashes of coaly mud.
"Fine effects," said Horrocks, waving his arm. "Here comes a train. The puffs of smoke, the orange glare, the round eye of light in front of it, the melodious rattle. Fine effects! But these furnaces of mine used to be finer, before we shoved cones in their throats, and saved the gas."
"How?" said Raut. "Cones?"
"Cones, my man, cones. I'll show you one nearer. The flames used to flare out of the open throats, great—what is it?—pillars of cloud by day, red and black smoke, and pillars of fire by night. Now we run it off in pipes, and burn it to heat the blast, and the top is shut by a cone. You'll be interested in that cone."
"But every now and then," said Raut, "you get a burst of fire and smoke up there."
"The cone's not fixed, it's hung by a chain from a lever, and balanced by an equipoise. You shall see it nearer. Else, of course, there'd be no way of getting fuel into the thing. Every now and then the cone dips, and out comes the flare."
"I see," said Raut. He looked over his shoulder. "The moon gets brighter," he said.
"Come along," said Horrocks abruptly, gripping his shoulder again, and moving him suddenly towards the railway crossing. And then came one of those swift incidents, vivid, but so rapid that they leave one doubtful and reeling. Halfway across, Horrocks's hand suddenly clenched upon him like a vice and
