sufficient time to make Nu quite sure that it was more than a wanton trick of his senses—the result of the great longing that was in his lonely heart for her whom this ephemeral and elusive effluvium proclaimed. As darkness came he approached closer to the bungalow, always careful, however, to keep down wind from it.

Through the windows he could see people moving about within the lighted interior, but he was not close enough to distinguish features. He saw men and women sitting about a long table, eating with strange weapons upon which they impaled tiny morsels of food which lay upon round, flat stones before them.

There was much laughter and talking, which floated through the open windows to the cave man's eager ears; but throughout it all there came to him no single word which he could interpret. After these men and women had eaten they came out and sat in the shadows before the entrance to their strange cave, and here again they laughed and chattered, for all the world, thought Nu, like the ape-people; and yet, though it was different from the ways of his own people the troglodyte could not help but note within his own breast a strange yearning to take part in it—a longing for the company of these strange, new people.

He had crept quite close to the veranda now, and presently there floated down to him upon the almost stagnant air a subtle exhalation that is not precisely scent, and for which the languages of modern men have no expression since men themselves have no powers of perception which may grasp it; but to Nu of the Niocene it carried as clear and unmistakable a message as could word of mouth, and it told him that Nat-ul, the daughter of Tha, sat among these strange people before the entrance to their wonderful cave.

And yet Nu could not believe the evidence of his own senses. What could Nat-ul be doing among such as these? How, between two suns, could she have learned the language and the ways of these strangers? It was impossible; and then a man upon the veranda, who sat close beside Victoria Custer, struck a match to light a cigarette, and the flare of the blaze lit up the girl's features. At the sight of them the cave man involuntarily sprang to his feet. A half smothered exclamation broke from his lips: "Nat-ul!"

"What was that?" exclaimed Barney Custer. "I thought I heard some one speak out there near the rose bushes."

He rose as though to investigate, but his sister laid her hand upon his arm.

"Don't go, Barney," she 

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