"I never thought of it!" cried Derrick. "We might. We'll try anyhow, for if we stay here another minute we shall be roasted to death."

Stooping, he lifted Paul in his lithe young arms, and with a strength born of despair began to carry him up the long and devious way that led to the very top of the lofty building. He had scarcely taken a dozen steps, and was already staggering beneath his burden, when he stumbled and nearly fell over some object lying on the floor. With an exclamation, he set Paul down and picked it up.

It was the crutch, Paul's own crutch; and it was so far above where they had sat at work that it seemed as though it must have been flung there.

The boys did not pause to consider how the crutch came to be where they found it, but joyfully seizing it, Paul used it so effectively that they quickly gained the top of the building and stood at the upper end of the long slope.

It was a framework of massive timbers supported by high trestle-work, that led from the highest point of the breaker down the hill-side into the valley, where it entered the ground. From there it was continued down into the very lowest depths of the mine. On it were double tracks of iron rails, up which, by means of an immensely long and strong wire cable, the laden coal cars were drawn from the bottom of the mine to the top of the breaker. As a loaded car was drawn up, an empty one, on the opposite track, went down. The angle of the slope was as steep as the sharply pitched roof of a house, and its length, from the bottom of the mine to the top of the breaker, was over half a mile.

This particular slope was provided with a peculiar arrangement by which a car loaded with slate or other refuse, after being drawn up from the mine to a point a short distance above the surface, could be run backward over a vertical switch that was lowered into place behind it. This vertical switch would carry it out on the dump or refuse heap. The top of the dump presented a broad, level surface for half a mile, on which was laid a system of tracks. Over these the waste cars were drawn by mules to the very edge of the dump, where their contents were tipped out and allowed to slide down the hill-side. During working hours a boy was stationed at this switch, whose business it was to set it according to the instructions received from a gong near him. This could be struck either from the bottom of the mine or the top of the breaker, by means of a strong wire leading in both directions from it. One stroke on the gong meant to set the switch for the mine, and two strokes to set it for the dump. A flight of rude steps led up along the side of the slope from the mouth of the mine to the top of the breaker.

Derrick and Paul thought that perhaps they might make their way down this flight of steps and thus escape from the blazing building; but when they reached the end of the slope, and looked down, they saw that this would be impossible. Already the steps were on fire, and the whole slope, as far as they could see, was enveloped in a dense cloud of smoke. Through it shot flaming tongues that were greedily licking the timbers of the tall trestle-work.

If Derrick had been alone he would have made the attempt to rush down the steps, and force his way through the barrier of smoke and flame; but he knew that for his companion this would be impossible, and that even to try it meant certain death.

As he hesitated, and turned this way and that, uncertain of what to attempt, an ominous crash from behind, followed by another and another, warned them that the floors of the building were giving way and letting the heavy machinery fall into the roaring furnace beneath. They knew that the walls must quickly follow, and that with them they too must be dragged down into the raging flames.

Paul, sitting on the floor, buried his face in his hands, shutting his eyes upon the surrounding horrors, and prayed.