Then they, too, broke into a jog-trot. In a moment they had emerged from the thick tangle of brownish-red stalks and were upon the banks of a wide and swiftly running river, the same river whose gleam Burl had caught the day before from the farther side of the mushroom forest. Once before Burl had floated down a river upon a mushroom raft. Then his journey had been involuntary and unlooked for. He had been carried far from his tribe and far from Saya, and his heart had been filled with desolation. Now he viewed the swiftly running current with eager delight. He cast his eyes up and down the bank. Here and there the river-bank rose in a low bluff, and thick shelf-growths stretched out above the water. Burl was busy in an instant, stabbing the hard growths with his spear and striving to wrench them free. The tribesmen stared at him, uncomprehending, but at an order from him they did likewise. Soon a dozen thick masses of firm, light fungus lay upon the shore where it shelved gently into the water. Burl began to explain what they were to do, but one or two of the men dared remonstrate, saying humbly that they were afraid to part from him. If they might embark upon the same thing with him, they would be safe, but otherwise they were afraid. Burl cast an apprehensive glance at the sky. Day was coming rapidly on. Soon the red mushrooms would begin to shoot their columns of deadly dust into the air. This was no time to pause and deliberate. Then Saya spoke softly. Burl listened, and made a mighty sacrifice. He took his gorgeous velvet cloak from his shoulders--it was made from the wing of a great moth--and tore it into a dozen long, irregular pieces, tearing it along the lines of the sinews that reinforced it. He planted his spear upright in the largest piece of shelf-fungus and caused his followers to do likewise, then fastened the strips of sinew and velvet to his spear-shaft, and ordered them to do the same to the other spears. In a matter of minutes the dozen tiny rafts were bobbing on the water, clustered about the larger, central bit. Then, one by one, the tribefolk took their places, and Burl shoved off. The agglomeration of cranky, unseaworthy bits of shelf-fungus moved slowly out from the shore until the current caught it. Burl and Saya sat upon the central bit, with the other trustful but somewhat frightened pink-skinned people all about them. And, as they began to move between the mushroom-lined banks of the river and the mist of the night began to lift from its surface, far in the interior of the forest of the red fungoids a column of sullen red leaped into the air. The first of the malignant growths had cast its cargo of poisonous dust into the still-humid atmosphere. The conelike column spread out and grew thin, but even after it had sunk into the earth, a reddish taint remained in the air about the place where it had been. The deadly red haze that hung all through the day over the red forest was in process of formation.