It was the engine fire of which the foreman spoke, and he was pointing to one of the magnificent steam fire-engines at the headquarters of the London Brigade.

HEADQUARTERS, METROPOLITAN FIRE-BRIGADE, SOUTHWARK.

"Here is a steam-match," he continued, "kept in readiness on the engine. It is like a very large fusee, and is specially made for us. Water won't put it out."

He strikes the match, and it burns with a large flame. He plunges it into some water near by, and it still continues to burn. It evidently means to flame until the engine fire is burning fast.

The wood also is carefully prepared, being fine deal ends, specially cut to the required size; while the coal is Welsh—the best for engine-boilers.

These details may seem trivial; but they assist in the rapid kindling of the engine fire, which is not trivial. But the rapid kindling of the fire is not the only reason why the brigade raises steam so quickly in its engines; in addition, a gas-jet is always kept burning by the boiler, and maintains the water at nearly boiling-point before the fire is lighted. This was a method adopted by Captain Shaw. But even this arrangement does not explain everything.

SECTION OF A STEAM FIRE-ENGINE BOILER.

To fully understand the mystery, we must leave this smart engine, shining in scarlet and flaming with brass, and go upstairs to the instruction-room for recruits.