As he did so, the hammers of Worth's gun became caught in something, and the next instant both barrels were discharged with a startling explosion.

"That's a good idea!" exclaimed Sumner. "Let's fire all our cartridges as fast as we can. Perhaps they are out looking for us, and will hear the shots."

So saying, he fired both barrels of his own gun into the air, and quickly reloading, fired again. Worth followed suit; but just as Sumner was ready to fire for the third time he was startled by a sharp crackling sound close beside him. He turned quickly. There was a bright blaze within ten feet of him. The first accidental discharge of Worth's gun, as it lay pointed directly into a mass of dry grass and dead palmetto leaves, had set this on fire. Worth instinctively sprang towards it with the intention of trying to stamp it out, but, with a joyful cry, Sumner restrained him.

"It's the very thing!" he shouted. "A back fire! Why didn't I think of it before? We must set a line of it as quick as we can!"

Worth did not understand, and hesitated; but seeing Sumner, with a bunch of lighted leaves in his hand, rush from one clump of palmetto to another, touching his blazing torch to their dry, tinderlike stalks, he realized that his companion knew what he was about, and began to follow his example.

Within five minutes a wall of flame a hundred yards in length was roaring and leaping in front of them, fanned into such fury by the high wind that they were obliged to retreat from its blistering breath. They could not retreat far, however, for during their delay the main fire had gained fearfully upon them, and its awful roar seemed one of rage that they should have attempted to escape from it. Mingled with this was the crash of falling trees and the screams of wild animals that now began to rush frantically past the boys. A herd of flying deer nearly trampled them underfoot; and directly afterwards they were confronted with the gleaming eyes of a panther. With an angry snarl he too dashed forward. Great snakes writhed and hissed along the ground, and Worth clutched Sumner's arm in terror.

Seizing his gun, the latter began shooting at the snakes; nor did he stop until his last cartridge was expended.

It was horrible to stand there helplessly awaiting the result of that life-and-death race between those mighty columns of flame; but they knew not what else to do. Now they could no longer see in which direction to fly. The swirling smoke-clouds were closing in on them from all sides, and only by holding their faces close to the earth could they catch occasional breaths of fresh air.

Sumner's plan was to remain where they were until the last moment, and then rush out over the smouldering embers of the fire they had set. The main body of this was now rapidly retreating from them. At the same time a fringe of flame from it was working backward towards them. Though they made feeble efforts to beat this out, their strength was too nearly exhausted for them to make much headway against it. The heat was now so intense that their skin was blistering, and their brains seemed almost ready to burst.

Worth had flung away his gun, just after loading it, when he began to set the back fires, and now the sound of a double report from that direction showed that the flames had found it. The noise of these reports was followed by a loud cry, and out of the smoke-clouds a strange, wild figure came leaping. It was a human figure. As the boys recognized it, they echoed its cry. Then by their frantic shouts they guided it to where they were crouching and making ready for their desperate rush into the hot ashes and still blazing remains of the back fire.