There was character, personality, individuality about these three in varying degrees. The rest of the islanders simply filled in and made, as it were, a fading human background. They counted for little or nothing. They were industrious people in the fashion of the tropics. They had evidently brought with them the products of Holland, even including tulips; and such of them as would grow in the tropics they had cultivated and continued to cultivate. They had not failed to perpetuate all that had ministered to their human daily needs, even as they had not altogether forgotten God and things spiritual and mental.

They would not allow Beekman to do any work. He more than paid for his board by the wonderful stories he told them, gathered after the evening meal, when men and women alike smoked their curious pipes. There were no books on the island. They had completely forgotten how to read. They had lost all memory of the outside world. They were circumscribed, shut in, by the towering walls of the crater, and their lives had grown correspondingly narrow and monotonous. Beekman had to adapt his remarks as if he were talking to children, and backward children, at that; yet two at least of his auditors manifested a quick comprehension and one far surpassed the rest. The old man and the young man easily understood, the girl even anticipated.

Kobo was too old to move about much. Hano had his work to do with the rest, but by a sort of universal consent Truda was a free agent. She and Derrick, at the latter's suggestion, thoroughly explored the island. It was due to him that certain things were rediscovered that had been forgotten, or, if remembered, considered of no moment.

With the girl as his guide and attendant he made a careful survey of the vast cup in which they lived. He was not much of a geologist, but it was easy to decide that here was the crest of a volcano, with a double cone, one being the great cylinder that formed the harbor; this, the smaller, the narrower, possibly the deeper entrance to the subterranean fires of long ago, had been filled with water from the sea through the rift. Into the other, the greater and shallower orifice, the earth had come, birds had dropped seeds, vegetation had sprung up and the oasis resulted.

There was but one source of fresh water on the island, the great spring that bubbled from a low cone in front of the palm-covered hillock where the houses were placed. The water was fresh, slightly mineral, slightly effervescent at its exit. It ran through tortuous channels until it pierced the encircling wall of rock through a rift, finally falling over the high cliff to the gulf beneath. So near as he could determine, that spring had never failed them.

The surrounding rock walls of the oasis were unsurmountable, both outside and in, in most places, like the walls of the harbor. There were two or three exceptions, however. There was an easy and practicable path to the place where he had first seen the girl performing that strange and mysterious ceremony of greeting, as it were, to the rising sun. There had been some objection to his going there. It seemed to be the custom that she and she alone should make that trip, but he had insisted and had soon acquired the habit of going with her every morning.

Through the rift a vast expanse of sea could be seen to the south and eastward. They could peer down into the gulf and mark the white water breaking on the barriers and the stretch of tossing sea beyond.

"Have you ever seen anything there?" he asked Truda.

"A few times, yes."

"What was it?"