On went Quib, and even Abe Selover could not see him more than half the time, for he had an immense deal of dodging to do, in and out among the rocks and trees, and it was dreadfully shady at the bottom of that ravine. The walls of rock, where Abe was, rose more than sixty feet high on either side, and the glen was only a few rods wide at the widest place. "He's holed him! He's holed him! Come on! we've got him, now!" Quib was scratching and yelping like an insane dog at the bottom of what looked like a great crack between two rocks, in the left-hand side of the glen as you went down. The crack was only an inch or so wide at the bottom, and twisted a good deal as it went up, for the rock was of the kind known as "pudding-stone." There was a hole, just there, large enough for a woodchuck, but too small for a dog. "Dig, boys! Dig!" "Dig yourself," said Pete Corry. "Who's going to dig a rock, I'd like to know?" "Let Quib in, anyhow. He'll drive him out." Abe was prying at that hole with a dead branch of a tree, and, almost while he was speaking, a great piece of the loose pudding-stone fell off and came thumping down at his feet. "A cave, boys, a cave! Just look in!" Quib did not wait for anybody to look in, but bounded through the opening with a shrill yelp, and Abe Selover squeezed after him. Pete Corry felt a little nervous when he saw how dark it was, but he followed Abe; and the other boys came on as fast as the width of the hole would let them. That is, they crept through, one boy at a time. What surprised them was, that the moment they had crawled through that hole they could stand up straight. "Where's the woodchuck?" asked Bob Hicks. "Woodchuck? Why, boys, this is a regular cave," replied Abe. "Quib's in there, somewhere," said Mart Penniman. "Just hear him yelp!" "Hold on," said Cole Thomas--"there's more light coming in. We shall be able to see, in a minute." The fact was that it took a little time for their eyes to get accustomed to the small amount of light there was in that cave. The cave itself was not very large. It grew wider for about twenty feet from the hole they came in by, and the floor, which was covered with bits of rock, sloped upward like the roof of a house, only not quite so abruptly. In the middle it was more than a rod wide. Then it grew narrower, and steeper, and darker with every step. But they knew about where the upper end must be, for they could hear Quib barking there. "It's dark enough," said Andy. "Come on, boys!" shouted Abe Selover. "We'll have that woodchuck this time. He's in this cave, somewhere." They were not very much afraid to keep a little way behind Abe Selover, and in a few minutes they heard him say: "Quib! Is he there? Have you got him?" Quib barked and whined, and the sound seemed to come from away above them. "Come on, boys! I can see a streak of light. It's like climbing up an old chimney. Quib's almost on him."