At this moment the Tree Frog opened his eyes a little and his mouth a great deal, and shot out his quick tongue. When he shut his mouth again, the big brother of the Frog-Hoppers was nowhere to be seen. They never had a chance to ask him that question again. If they had but known it, the Tree Frog at that minute had ten legs, for six and four are ten. But then, they couldn't know it, for six were on the inside.