"The best we can do is to tramp along the water's edge," said Dick. "Then when we reach the center we can go inland."
"We haven't over an hour," replied his youngest brother. "By that time it will be too dark to do much more. And we'll have to find some suitable place to camp for the night."
"Oh, we can camp anywhere," cried Tom. "It's good enough—just for one night."
They began to trudge along the edge of the horseshoe curve, over smooth sand. But this did not last, and presently they came to a muddy flat and went down to their ankles. Dick was ahead and he cried to the others.
"Stop! It's not fit to walk here!"
"Why, it's like a bog!" declared Sam, after testing it.
"We'll have to go inland a distance," said Tom. "Come on," and he turned back and struck out for the palms and bushes beyond.
It was then that the Rover boys began to realize what was before them. Scarcely had they penetrated the interior for fifty yards when they found themselves in a perfect network of trailing vines. Then, after having pulled and cut their way through for fifty yards more, they came to a spot that was rocky and covered with a tangle of thorny bushes.
