“It doesn’t say how far it is,” Dick stated, as he unfolded the now soiled piece of paper. “But it isn’t so very far because the cross, indicating its position, is very close to the river.”

“That doesn’t mean anything,” Sandy turned away in disgust. “How do we know at what point along the river the mine is? We may be fifteen or twenty miles out of our course, for all you know. The place where we cross may be miles and miles away from the mine.”

Dick placed an agitated finger on the map and bit his lips in vexation. Sandy was right. How could they possibly find the mine unless they knew at least approximately at what point along the river it was situated? And then, suddenly, staring at the paper in his hand, he became aware of something he had not noticed before. Across the upper portion of the map, Thunder River was indicated by a line, a fairly straight line throughout its entire length. A casual or fleeting look at the line brought out nothing of importance, but a close and careful examination showed that, midway between the source and mouth of the river, there was a tiny loop or bow. Within this bow, on the opposite or upper side of the line, was the “X,” which showed the location of the mine.

“I’ve got it!” Dick shouted. “There’s an abrupt curve in the river at only one place—opposite the mine. When we find that curve, we’ll know where to cross.”

Sandy took the map from his friend and inspected it closely, silently.

“Yes, the curve is there,” he was forced to admit. “And it ought to simplify matters, too. The next thing on our program is to find it.”

“Why not do as I just proposed,” said Dick. “While we’re hunting for a place to cross, we may find the bow.”

It seemed about the only thing to do under the circumstances. In a short time the boys had staked out the ponies, and had picked up their rifles in preparation for departure. Toma, who had been looking about, suddenly exclaimed:

“I have good idea. I climb big, tall tree over there an’ mebbe I find out where river makes turn. I go up see.”

He crossed over to the tree at a brisk trot and commenced climbing up. It was a huge, towering spruce, and it was several minutes before he reached the top.