"With this harp and my beautiful voice, I will soon be a rich man," he assured them earnestly, and with many goodbyes and good wishes the four travellers left them to make their fortunes. Long after they had descended the steps and entered the subway itself, they could hear the plaintive wails of the sad singer and the thrum of the harp he had picked from the Indus Tree. It was dim and mysterious in the underground passageway, and after looking in vain for a car or train to carry them Up Town, Betsy began following the arrows painted on the white washed walls. "There ought to be a car somewhere," panted the little girl, after they had made at least fifty turns. "Try mine," invited Carter, and with a tired smile Betsy dropped into the wheel-barrow. Reddy was riding the Hungry Tiger, and after they had proceeded for more than an hour, the arrows stopped altogether. "Well, this isn't like our subways at all," exclaimed Betsy in disgust. "When you take a subway at home, you get somewhere." "Isn't this somewhere?" asked Carter, stooping a little so he could enter a rough stone cavern at the end of the tunnel. Whistling cheerfully, he trundled Betsy through the low doorway. The Hungry Tiger followed, sniffing the air suspiciously, and it must be confessed that the little rock chamber did not look very inviting. The walls were of jagged gray stone, the floor damp and slippery and the whole place dismal and chilly as a vault. A feeble light flickered down from an opening in the ceiling and after a discouraged look round, Betsy shook her head. "We'll have to go back Down Town," she sighed sadly. "I'll have to be a cash girl after all!" "No you won't!" called Reddy. He had jumped off the tiger and gone to examine the back of the cavern. "Here's a door!" Hurrying over, the others saw that the little Prince was right. "'Cave Inn,'" roared the Hungry Tiger, reading the door plate over the little boy's shoulder. "'Knock three times.' Why, that's fine! If it's an Inn, they'll surely have something to eat. We can't get out so we might as well go in," he finished with a playful wink at Carter. Stepping back a few paces, the Hungry Tiger ran at the door and bumped his head three times against the brass plate. At the third bump, the door of Cave Inn flew open, the floor of the cave itself, tilted forward and the four adventurers fell through. Stones and dirt rattled down after them and the Hungry Tiger's growls mingled with the screams of Betsy and Evered, as they went tumbling down into the darkness. CHAPTER 10 The Magic Spectacles Kaliko, King of all the gnomes, and metal monarch besides, sat gloomily on the jewelled rock throne in his underground cavern. "Nothing ever happens here," complained Kaliko, frowning at his Royal Chamberlain. "Let's have a war," proposed Guph, looking up from the ruby scepter he was polishing. "We haven't had a war since Ruggedo left."