The leaves in many places met overhead, and caused a perpetual twilight in the forest aisles. As the boys penetrated deeper and deeper toward the heart of the woods the underbrush and vines grew continually thicker, and in many places they found their progress stopped by some tangled growth and were forced to cut it away before they could proceed. It grew hotter and hotter, too, with a damp, clammy heat that at last became almost unbearable.

"Great Scott!" burst out Dick, at last, while they were cutting through a particularly tough growth of vines and creepers. "I think this is about the hardest work I ever did in my life. What you need to make a path in this blooming jungle is a carload of dynamite—not merely a few little toad-stickers like these we're using."

"Well, as we haven't the dynamite handy, I suppose we'll have to make the best of the 'toadstickers,'" laughed Bert, amused by his companion's rueful countenance. "You didn't expect to find a macadamized road running through this little strip of woodland, did you?"

"No, but I didn't expect to find vines made of cast iron, either," replied Dick.

"Never mind, old scout," said Bert, "this can't last long. We're certain to hit on a game trail sooner or later, and then we'll be in clover. And the harder we work now, the sooner we'll find it."

"Oh, well, here goes," responded Dick, and fell to with renewed vigor.

Before very long it turned out as Bert had predicted. After cutting through a particularly dense thicket, they had not gone far when they stumbled on a narrow but clearly defined trail that ran in a southeasterly direction.

"Eureka!" exclaimed Tom, as this welcome sight met their eyes, "it will be plain sailing from now on, and we ought to be able to get somewhere."

"We don't know where we're going, but we're on the way," sang Bert. "Forward, march, fellows. Christopher Columbus had nothing on us as discoverers."

"Righto," agreed his companions, and they set forth along the narrow path at a brisk pace.