“Ow-ow! Did you see that?” he gasped.

“I did,” said Tom sternly, “and unless you also want to see stars you had better dry up, Jack Dacre. There’s some excuse for old Joe, but none for you.”

“Ber-ber-but these woods seem full of ghosts!” complained poor Jack.

“And cowards,” supplemented Tom dryly.

Old Joe got to his feet. A strong smell of scorching pervaded the camp. Some coals, too, had lodged in his white whiskers, singeing those venerable appendages. In spite of the scare he had got, Jack couldn’t help laughing at the old man’s woebegone appearance.

“Oh, mes enfants!” wailed the old trapper, “les Loups Galoups have passed ovair us!”

“Rot!” snapped Tom. “Your Loop of Glue was only an old white owl. As for the other noises, I have a theory which I will prove in the morning. Now let’s turn in.”

CHAPTER XVIII—TOM PLAYS DETECTIVE.

While the others were getting things in readiness for resuming the march the next day Tom began an investigation. He had at first thought that the mysterious noises of the night had been caused by their old enemy, but some reflection made him believe that he was mistaken.

In the first place the thief, having had the good fortune to have his trail wiped out by the snow, was not likely to be foolish enough to come back and leave a fresh one. In the second, he was probably aware that his first attempt had failed to scare the boys off his track. At any rate, his continued haste along the trail appeared to conduce to such a belief.