Martine was correct in her surmises, and for half an hour the two felt like explorers as they picked their way from stone to stone, filling their hands with trophies.

"Isn't it fun?" cried Martine. "I feel as if we were quite alone in the world. We can just enjoy ourselves without thinking of history or geology, or anything else."

"I wonder if the others will be worried," said Priscilla, who herself was not quite sure that she enjoyed this sensation of being quite alone in the world, with nobody near but Martine.

"Of course they won't be worried. We shall be back before they even miss us. Besides, I'd like to worry Mr. Knight."

Priscilla looked at her watch. "I think that we ought to return now; we have been gone more than half an hour."

"Oh, not yet—but listen; some one is calling. It is Mr. Knight. 'Young ladies, young ladies,'" and Martine mimicked the tones that now were borne quite clearly to their ears. "I just won't have him find us, and lead us back as if we were two children who had done something that we shouldn't; let us hide behind these rocks until he passes."

Somewhat against her will Priscilla allowed herself to be led into a rocky nook where a jutting ledge hid them effectually from any passer-by.

So Mr. Knight, walking along the cliffs above them, even had he peered down to the lower level, could hardly have seen them. His "Young ladies, young ladies, we're starting home now," grew feebler and feebler, and when Martine had assured herself that he was really a safe distance away, she came out from her hiding-place with a cry of "Danger past."

"We mustn't stay here too long," remonstrated Priscilla; "Mrs. Redmond will be worried."

"I am perfectly willing to go now," replied Martine, "since Mr. Knight won't lead me by the nose. We had a hard climb to this grotto, but it will be much easier going down."