replied Dorothy; "but I can't do any magic at all, an' so I can't figure out e'zactly how you an' Glinda an' the Wizard do it." "Don't try," laughed Ozma. "But you have at least one magical art, Dorothy: you know the trick of winning all hearts." "No, I don't," said Dorothy earnestly. "If I really can do it, Ozma, I am sure I don't know how I do it." It took them a good two hours to reach the foot of the round, flat mountain, and then they found the sides so steep that they were like the wall of a house. "Even my purple kitten couldn't climb 'em," remarked Dorothy, gazing upward. "But there is some way for the Flatheads to get down and up again," declared Ozma; "otherwise they couldn't make war with the Skeezers, or even meet them and quarrel with them." "That's so, Ozma. Let's walk around a ways; perhaps we'll find a ladder or something." They walked quite a distance, for it was a big mountain, and as they circled around it and came to the side that faced the palm trees, they suddenly discovered an entrance way cut out of the rock wall. This entrance was arched overhead and not very deep because it merely led to a short flight of stone stairs. "Oh, we've found a way to the top at last," announced Ozma, and the two girls turned and walked straight toward the entrance. Suddenly they bumped against something and stood still, unable to proceed farther. "Dear me!" exclaimed Dorothy, rubbing her nose, which had struck something hard, although she could not see what it was; "this isn't as easy as it looks. What has stopped us, Ozma? Is it magic of some sort?" Ozma was feeling around, her bands outstretched before her. "Yes, dear, it is magic," she replied. "The Flatheads had to have a way from their mountain top from the plain below, but to prevent enemies from rushing up the stairs to conquer them, they have built, at a small distance before the entrance a wall of solid stone, the stones being held in place by cement, and then they made the wall invisible." "I wonder why they did that?" mused Dorothy. "A wall would keep folks out anyhow, whether it could be seen or not, so there wasn't any use making it invisible. Seems to me it would have been better to have left it solid,