For mutual safety the boys remained near one another as they worked, and timber was so plentiful that their progress was not interfered with by this arrangement. Their rifles were within reach, and their eyes and ears were alert. The hour of noon brought a brief but pleasant rest, and the afternoon slipped quickly away. As supper time drew near, John, having had only a cold lunch at noon, was becoming very hungry and was about to mention that fact, when, instead, he suddenly seized his rifle and sprang behind a tree. At the same instant Ree did likewise. "As sure as shooting I heard some one cough!" exclaimed John in an undertone. "I heard a footstep," Ree quietly answered. "Ho ho!" It was Tom Fish who called, and coming forward, he confessed that he had been trying the boys' watchfulness by trying to steal up to them without being discovered. He was decidedly surprised to find them so quick to detect his approach, for he had scarcely come within gun shot. Tom declared to John, however, that he had not coughed, saying it must have been John's alert instinct which told him that some one was drawing near, and made him imagine he heard such a sound. The boys did not agree with him, however, for he also undertook to say that Ree had not heard a footstep at all, but being keenly alive to detect the approach of anyone, had imagined he heard a noise before he really did, all through that peculiar sense which he called instinct. "But anyway it's a good thing for you, Tom Fish, that you hollered when you did," said John. "I was just on the point of giving you a dose of these lead pills that you are so everlastingly talking about!" Tom's face lengthened. "You don't want to be too quick with your pill box, boy," said he. "You want to see what an' who you're shootin' at. Great Snakes, now! What if ye had peppered away at me?" "Well, don't come creeping up like a sneaking Mingo then," laughed John, and Ree, who knew that John had not seen Tom until after he called, and had been really frightened, joined in his chum's merriment. "But tell us what you found, Tom," urged Ree. "Well, I'll tell ye," Tom slowly and very soberly answered, "I don't know what to make of it. Them tracks was made by a redskin an' they came straight to the camp along the trail we made yesterday. Then after leaving here, they strike off an' go straight to the little lake across from the Delaware town, an' there they stop. It's plain as kin be, that some varmint from that there town has been spyin' on us. Now was it the same critter as killed the horse, or wa'n't it? An' if it was, was that critter the Buffalo chap? An' what was he hangin' 'round here ag'in for last night?"