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Updated: June 1, 2025
We passed many oblong hills of limestone, the horizontal layers of which upon the slopes present tiers of steps, one behind the other. These hills were astonishingly overgrown with trees, and formed masses of the darkest green. There was a great deal of subterranean water, and sink-holes produced by caving over such streams were frequent. The soil generally was a residual red or brownish clay.
"Can't!" cried an echo close at hand. "Fly!" suggested a distant mocker. Thad closed his mouth and sat down. He had moved very cautiously, for he knew that these sink-holes are often the entrance of extensive caverns, and that there might be a deep abyss on any side.
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