The youth had all he could do to prevent coming in contact with thorns and fringed plants, but he did his best. But what of thorns when Professor Bigelow needed help?

On and on he went, swinging his rifle over shrubs and bushes. At times it was necessary to hold his arms high above his head to prevent striking limbs and other projections.

At last, after what seemed a terribly long time, he parted the foliage and gazed ahead to see what was happening. Then a look of rage came on his face.

On the river bank a terrific struggle was taking place between Professor Bigelow and the two Indians who had been left behind. The men had the professor down, and the latter’s face was ghastly white as strong arms and hands tried to choke him into unconsciousness. Occasionally he would manage to call out a muffled cry for assistance.

For a moment Bob took in the situation carefully. Then he rushed at the men with rage and fury and landed on the back of the one nearest, bearing him to the ground with a thud. The Indians glanced up in surprise at this abrupt interruption, and they turned to deal with this new enemy.

One of the men gained his feet and launched himself with all force at Bob’s side, the impact hurling the youth from the back of the first man. But Bob shook the fellow off and threw an arm around his neck with the strength of one in desperation. There was a terrific struggle, and the two thrashed about, neither able to gain the upper hand. Bob gripped the Indian’s neck with all his strength, and the man’s face began to turn purple from the terrific strain. It was clearly evident that he would soon be put out of the fight.

But the other Indian was not motionless. In fact if it had not been for him, the youth would have had the better of the first fellow, for he was slowly giving out. But suddenly Bob felt a heavy body landing on his back and had to release his hold on the first man.

This again gave the Indians the advantage, and they were quick to sense their chance.

Bob soon saw that he could gain nothing as things were. He must resort to some other means.

Professor Bigelow was now beginning to show signs of life, but he was so badly battered that what little he did to help amounted to nothing, for he was soon sent sprawling to the ground.