Dorothy and the Wizard in Oz Chapter 9 - They Fight the Invisible Bears

In which Dorothy and her companions dine with the gentle, invisible inhabitants of the Valley of Voe and learn the peculiar perils posed by the unseen bears that roam there, as well as the secret of walking safely upon the water. They then make a daring escape across the river on enchanted leaves and hasten toward the mysterious Pyramid Mountain, pursued by their fearsome adversaries yet aided by their resourcefulness and faithful steed.