The startling idea had occurred to Tubby that, all unbeknown to themselves, they might inadvertently stray across the line, and be arrested as invaders, by some of those alert Canadian guards mentioned by Rob. The thought disturbed him considerably, and he was about to speak of it, despite the jeers with which he felt sure Andy would greet the idea, when something else suddenly came to pass that completely put it out of his head.

There was a crashing sound heard close by, a swishing of the undergrowth, and then a bounding object flashed into view, which took on the shape of a two-year-old buck, leaping frantically over logs and bushes, as though possessed. Upon his neck and shoulders the boys glimpsed a strange, mysterious gray hunch!

Upon his shoulders the boys glimpsed a strange, mysterious gray hunch.

CHAPTER II
RUMBLINGS OF COMING TROUBLE

“Oh! Did you see that hump on his back, Rob? What could it have been?” gasped Tubby, gripping the sleeve of the other’s khaki coat in his excitement.

“Why, Tubby, don’t you know that was the pirate of the northern woods?” cried the equally aroused Andy, who had also been stupefied while the little drama was being enacted, and only recovered the use of his hands, and realized that he was carrying a gun, when the leaping buck had completely vanished from view.

“Do you mean a filibuster?” asked the stout boy incredulously.

“Well, yes; you might call a panther by that name,” laughed Rob.

“A panther!” echoed Tubby, thrilled more than ever. “Was that what the bunch across the poor deer’s shoulders was, Rob? Oh, to think we didn’t get a chance to use a gun and save the noble buck!”