All about them the young beavers' voices had risen, and several angry disputes were taking place. Evidently some accidents had occurred among the little animals, too. The Shaggy Man said sadly, "Well, this seems to be the Barrier of Invisibility, and it's most effective too. I propose we all stay just where we are until we decide what to do for we all seem to be quite invisible." "Must we turn back?" asked Twink anxiously. "Don't you worry, Twink," said Tom, "even if we can't get to the Land of Oz, we'll find our way home." "Yes, I think we must turn back," announced the beaver King. "Let us retreat in the tunnel to the point where the Barrier of Invisibility begins. It should be only a few feet from where we are now since we just entered it." "But we have turned about and lost all sense of direction since becoming invisible," said the Shaggy Man. "Since we cannot see the tunnel, it looks the same in every direction, so how are we to know which way to turn to go back?" "Walk ten steps in one direction and if you are still invisible, then turn about and walk twenty feet in the other direction," instructed the beaver King. This they all did and after a bit of experimentation and several minor collisions, they were relieved to find themselves visible once more and standing on the edge of the Barrier of Invisibility. At the King's order, the young beavers had remained where they were, until the others had found their way out of the Barrier. Now the beaver King uttered a series of calls that quickly guided the animals beyond the Barrier of Invisibility. Shaggy and his friends stood about in the tunnel gazing from one to another, almost despairingly, wondering what to do next. "There is still hope that we may not have to go back and may be able to use the tunnel to reach Oz, my friends," began the beaver King quietly. "Last night and far into the morning, while you were sleeping, I was busy in my fairy workshop, studying the problem. I believe I have solved it, although, of course, we cannot be quite sure until we make the test." With this the little animal unstrapped from his back the small bundle he had been carrying. Laying it on the tunnel floor, he carefully unfolded it. The bundle seemed to consist of a number of shimmering pieces of silver cloth, so light they might have been spun from spider webs. The beaver King selected one of the folds of gossamer cloth and handed it to Twink. "Unfold it and put it about you, my dear," he said. "I think you will find it just your size." Twink did as instructed and found the cloth fitted about her like a fairy cloak. "Oh, it's lovely," she exclaimed. "It's more than that, I hope," said the beaver King. "It is a Cloak of Visibility." "A cloak of what?" exclaimed the Shaggy Man.