The young Englishman shook his head. "No," he said, "I cannot understand."
"I doubt if the lions or the man are here necessarily for the purpose of harming us," said Tarzan, "because there has been nothing to prevent their doing so long before had they wished to. I have a theory, but it is utterly preposterous."
"What is it?" asked the girl.
"I think they are here," replied Tarzan, "to prevent us from going some place that they do not wish us to go; in other words we are under surveillance, and possibly as long as we don't go where we are not wanted we shall not be bothered."
"But how are we to know where they don't want us to go?" asked Smith-Oldwick.
"We can't know," replied Tarzan, "and the chances are that the very place we are seeking is the place they don't wish us to trespass on."
"You mean the water?" asked the girl.
"Yes," replied Tarzan.
For some time they sat in silence which was broken only by an occasional sound of movement from the outer darkness. It must have been an hour later that the ape-man rose quietly and drew his long blade from its sheath. Smith-Oldwick was dozing against the rocky wall of the cavern entrance while the girl, exhausted by the excitement and fatigue of the day, had fallen into deep slumber. An instant after Tarzan arose, Smith-Oldwick and the girl were aroused by a volley of thunderous roars and the noise of many padded feet rushing toward them.
