He had not over-estimated the force of the current. As the light craft got into the swirl, the black water caught it like a feather. Ross pulled with all his might, but the banks slipped by as though he were in tow of one of the river steamboats. Never had the boy tugged at a pair of oars as he did now, and never had he so wished for a good boat and for real oars. He was only two-thirds of the distance across to the house when it came into sight, only a little distance below him.

He would not reach it!

With the energy of despair, Ross tugged on his oars, every muscle of his body tense with the strain.

Rex, divining the struggle, stood silent, not looking forward over the bow as he had been doing, but watching his master as he toiled with his oars.

Then, out from the darkness, shot the long black menace of a floating tree trunk. Straight for the boat it sped.

From the window, now close at hand, came a cry:

"Look out, Ross! Look out!"

Ross saw the danger. He knew, if he backed water, or halted long enough to let the tree go by, he would infallibly be swept past the house and all hope of rescuing Anton would be gone. He saw, too, that if the tree struck the frail boat, it would sink it as a battleship's ram sinks a fishing-boat in a fog at sea. He might win through, but if it struck—

The oars creaked with the sudden strain thrown on them.

On came the tree, but, just as it was about to strike the boat, it checked and turned half over, as the projecting stump of a broken bough caught on the ground below. For an instant, only, the tree halted and began to swing.