So far as Frank could see, the eagle had seized the salmon by the middle of its back, the fish twisting itself crossways as it was carried up into the air. The next moment there was a splash in the water and the bird swooped down again. When it rose it held its prey differently, and Frank fancied he could see one wicked claw gripping the fish close by the back of its neck, while the other was spread out toward its tail. In any case, the salmon did not seem able to wriggle now, and the eagle flew off with it and vanished among the tops of the black firs. "Not a big fish, but I've a notion the eagle could lift a thing as heavy as itself," said Harry. "They're mighty powerful. It might be the one he dropped, though I think it's another." Frank had no idea how much an eagle weighed, but he realized something of the capabilities of a bird that could carry off this fish apparently without an effort, and, what was more astonishing, drag the tremendously muscular creature out of the water which was its home. Then his companion touched his shoulder. "Watch those two fellows in the eddy," said he. "They're going to rush the fall." Frank saw two slim shadows shoot out beneath a wreath of circling foam and flash--which seemed the best word for it--through the crystal depths of the slacker part of the pool. They were lost in the snowy turmoil near the foot of the fall, and a few minutes passed before he saw them again. Then one shot out of the water like a bow that had suddenly straightened itself, gleamed resplendent with silver, and plunged into the foam again. Harry pointed him out the other, and though it was a moment or two before he could see it he marveled when he did. It had its dusky back toward him, for now and then the dorsal fin rose clear, and it was swimming up a thin cascade which poured down a steep slope of stone. That any creature should have strength enough to stem that rush of water seemed incredible, but there was no doubt that the fish was ascending inch by inch. Then it found a momentary harbor in a little pool just outside the main leap of the fall, and shot out of it again with its curious uncurving spring. Frank watched it eagerly when it dropped into the fall, and it was with a sense of sympathy that he saw its gallant efforts wasted as it was suddenly swept down. Before reaching the bottom, however, it had evidently rallied all its powers, for it flashed clear into the sunlight, and had recovered a fathom when he lost sight of it once more. After that he glanced back toward the shallows and saw that other birds had appeared. He did not know what they were, and Harry could only tell him that they were fishhawks of some kind. As he watched them wheeling or stooping, dropping upon the sparkling stream, and screaming now and then, the boy began to form some idea of the desperate battle for existence that is fought daily and hourly by the lower creation. "There don't seem to be a great many salmon," he remarked.