So Tom swam away. He was very much ashamed of himself, and felt all the naughtier; as little boys do when they have done wrong and won't say so. Then he came to a pool full of little trout, and began tormenting them, and trying to catch them: but they slipped through his fingers, and jumped clean out of the water in their fright. But as Tom chased them, he came close to a great dark hover under an alder root, and out floushed a huge old brown trout ten times as big as he was, and ran right against him, and knocked all the breath out of his body; and I don't know which was the more frightened of the two. Then he went on sulky and lonely, as he deserved to be; and under a bank he saw a very ugly dirty creature sitting, about half as big as himself, which had six legs, and a big stomach, and a most ridiculous head with two great eyes and a face just like a donkey's. "Oh," said Tom, "you are an ugly fellow to be sure!" and he began making faces at him; and put his nose close to him, and halloed at him, like a very rude boy. When, hey presto! all the thing's donkey-face came off in a moment, and out popped a long arm with a pair of pincers at the end of it, and caught Tom by the nose. It did not hurt him much; but it held him quite tight. "Yah, ah! Oh, let me go!" cried Tom. "Then let me go," said the creature. "I want to be quiet. I want to split." Tom promised to let him alone, and he let go. "Why do you want to split?" said Tom. "Because my brothers and sisters have all split, and turned into beautiful creatures with wings; and I want to split too. Don't speak to me. I am sure I shall split. I will split!" Tom stood still, and watched him. And he swelled himself, and puffed, and stretched himself out stiff, and at last--crack, puff, bang--he opened all down his back, and then up to the top of his head. And out of his inside came the most slender, elegant, soft creature, as soft and smooth as Tom: but very pale and weak, like a little child who has been ill a long time in a dark room. It moved its legs very feebly; and looked about it half ashamed, like a girl when she goes for the first time into a ballroom; and then it began walking slowly up a grass stem to the top of the water. Tom was so astonished that he never said a word: but he stared with all his eyes. And he went up to the top of the water too, and peeped out to see what would happen. And as the creature sat in the warm bright sun, a wonderful change came over it. It grew strong and firm; the most lovely colours began to show on its body, blue and yellow and black, spots and bars and rings; out of its back rose four great wings of bright brown gauze; and its eyes grew so large that they filled all its head, and shone like ten thousand diamonds. "Oh, you beautiful creature!" said Tom; and he put out his hand to catch it. But the thing whirred up into the air, and hung poised on its wings a moment, and then settled down again by Tom quite fearless.