Bluff brought up the rear. It was anything but light under the dense growth of trees and clinging vines. At times the tracker had to get down close to the ground in order to see what he wanted.

Bluff had slung his gun over his shoulder by the strap, and was holding Will’s camera in his hands, wondering if he had not been foolish to bring such a silly thing along with him on so serious an errand.

The deeper they penetrated into the interior of the island the denser the undergrowth seemed to become, until at times it was only with the utmost difficulty they pushed their way through. Others having gone ahead of them made it a trifle easier, perhaps; at least Tom Somers said so in a whisper.

“Perhaps we’re gettin’ clost to the place, now, pardners; so we’d better take our time an’ not hustle too much. Don’t speak above a whisper, either,” he said, as he parted the bushes in front.

Even as he did so Frank heard him utter a low exclamation, not of fear so much as of disgust. One look told the other what it meant, and he, too, feared that their plans would all be disarranged through an accidental meeting with a resident of the jungle, who seemed disposed to dispute their further progress.

There was the biggest wildcat Bluff had ever seen in all his life squatted on the low limb of a tree, growling angrily, and with it claws digging into the bark after the manner of a cat that is getting ready to jump, and will not be stopped!

True, Frank could easily have raised his gun and shot the ferocious creature dead in its tracks; but such an explosion must warn the enemy of their presence in the vicinity, and effectually prevent any surprise.

It looked like a serious problem, and yet it must be solved immediately unless they wanted to experience an encounter at close quarters with that fury.

“Hold up! give me a chance. Duck your heads, fellows; I’m going to flashlight the critter!” exclaimed Bluff. And even as he spoke, there was a sudden startling illumination that lit up the immediate vicinity like day.

CHAPTER XVIII—UNDER THE CABIN WALL