"I shall treasure my limestone 'icicle'," said Dorothy. "I shall score if I take it to the geology class at school." "I've got an extra one to give to the College museum," said Gabrielle. "I hope they won't break in my pocket. I've wrapped them carefully in my handkerchief." Arrived at the chute, Percy climbed up first, with one end of the rope in his hand, then, stationing himself firmly at the top, announced his readiness to haul up the others. Gabrielle started next, crawling on hands and knees, and helping herself as best she could by the projections of rock at the side. It was much more difficult to ascend than to descend, for the surface was so smooth and slippery, it was impossible to get any grip. Almost her whole weight depended upon the rope; she was a heavy girl, and the strain was great. Percy at the top heaved with all his strength. "Oh dear, it's dreadful!" cried Gabrielle. "It's cutting my waist in two. Wait a moment, Percy; don't tug so hard. I want to catch this ledge." "Let go of the rock, and I'll give one good pull," commanded Percy. "If you'll trust yourself absolutely to me, I'll have you up in a jiffy." Gabrielle loosened her hold, and for one moment threw herself entirely upon the rope. Perhaps it was not strong enough for the purpose, or possibly it had been frayed in the descent by contact with a sharp rock; there was a snap, a sudden, agonized cry, and Gabrielle was precipitated to the bottom of the chasm. She fell heavily, extinguishing her candle as she went, and rolling almost to the feet of Eric and Dorothy, who were standing at the bottom of the chute looking upwards. "Good gracious! What's happened? Gabrielle, are you hurt?" ejaculated Percy, descending to the rescue with more haste than discretion, and bending over the prostrate form of his sister. "Hold a light, Eric; I can't see her face." "Oh! Oh! I thought I was being killed!" gasped Gabrielle, raising herself to a sitting position. "Give me your hand, Percy. Oh! Stop, stop! My foot! I believe I've broken my ankle!" The explorers stared at one another in blankest dismay. This was indeed a predicament. What were they to do, buried in the depths of the earth, and miles away from help of any kind? "Are you sure it's broken, or could you manage to get up if we each took your arm?" suggested Eric. "No! No! Don't touch me! It's agony if I move." "Better let me pull your boot off, quick!" said Dorothy, dropping on her knees by the side of her friend. It was a very different matter applying First Aid here from what it had been at the ambulance class in the gymnasium at the College. Except pocket-handkerchiefs, there were no materials of any kind to be had. Splints were an impossibility. Dorothy bound up the foot as well as she could, but her every touch was painful to her poor patient. "You're sitting in such a wet place! Couldn't we lift you just a little?" she suggested. "No; please leave me alone. Never mind the wet."