“And this one looks like a dog lying down,” said Hinpoha, pointing to another.

Laughing, shouting, exclaiming, they explored the wonders of the cave until a heavy shock as of something falling, accompanied by a deafening crash, rooted them to the ground with fright. “What is it? What has happened?” they asked one another, and made their way back to the entrance. But the entrance was no longer there. Where it had been there was a solid wall of stone. Their climbing around among the ruined walls had sent some of the bricks sliding and these had released a large rock which had rolled down directly over the opening into the crystal cave. With desperate force they pushed against the rock, but their sevenfold strength made no more impression than a fly brushing its wings against it. With white faces they turned to each other when they realized the truth. They were imprisoned in the cave!

“The other direction!” cried Sahwah, shaking off her terror and setting her wits to work. “We may be able to get out the other way.” Taking the flashlight from Gladys, whose trembling fingers threatened to drop it, she led the way into the gloomy recesses of the cave, whose depths they had penetrated only a short distance before. They shuddered at the icicle like crystals, which now seemed like long fingers reaching down to catch a hold of them, and shrank back from the crystal masses that took the forms of men and animals. These now seemed like ghosts of creatures that had been trapped in the cave as they were. For trapped they were. In a few moments their progress was barred by impassable masses of crystal. Back again they went to the rock-blocked entrance and beat upon it and pushed with all their might. All in vain. The rock stood firm as Gibraltar. They shouted and called and screamed until the echoes clamored hideously, but no answering call came from the outside. From somewhere, far in the distance, came the dismal sound of falling water, chilling the blood in their veins.

Helplessly the girls all turned to Nyoda, asking, “What shall we do?”

Nyoda stood still and tried to face the situation calmly. She held her flashlight close to the rock and looked carefully all around the edge. At one side there was a tiny fissure, not more than half an inch wide and about six inches long, caused by the irregular shape of the rock. Nyoda regarded this minute opening thoughtfully. “If we could put something through that opening which would act as a signal, we might attract somebody’s attention who wouldn’t be able to hear us calling,” she said at length. “Our voices are so muffled in here they can’t carry very far outside.”

“Is there anybody on the island to see it?” asked Gladys doubtfully.

“There are some people here,” answered Nyoda, “because the fishermen stay all the year round. You remember those houses we passed on the other side of the quarry, where the nets were hanging in the yard?”

“What shall we use for a signal of distress?” asked Gladys. “Not one of us has a tie or a ribbon on today.”

“Use my dress skirt,” said Katherine generously. “It’s so torn anyway that it’ll never feel the same again, even if it recovers from this trip.” Which was perfectly true. So they tore the wide hem from her dress, which made a pennant about six feet long. Then Sahwah had a further inspiration, and, dipping her finger into a dark puddle formed on the floor by a thin stream of moisture trickling down the wall, she wrote the word HELP on the strip. Nyoda poked the end through the opening and shoved the rest out after it, keeping the other end in her hand, and she could feel by the tugging at the strip that the high wind had caught the portion outside and was whipping it about.

“Now shout for all you’re worth,” commanded Nyoda.