"That is all the difference now," she answered, "but it will take a long, long time for your tail to disappear. It will happen with that quite as it did with your breathing-gills. You will grow bigger and bigger and bigger, and it will grow smaller and smaller and smaller, until some day you will find yourself a Frog." She shut her mouth to get her breath, because, you know, Frogs can only breathe a little through their skins, and then only when they are wet. Most of their air they take in through their noses and swallow with their mouths closed. That is why they cannot make long speeches. When their mouths are open they cannot swallow air.