Happy Jack looked at Chatterer, Chatterer looked at Peter Rabbit, and Peter looked at Jumper the Hare. On the face of each was such a funny, puzzled expression that Old Mother Nature almost laughed right out. Finally Peter Rabbit found his tongue. “If you please,” said he, “I guess we don't know what you mean by an order.” “I thought as much,” said Old Mother Nature. “I thought as much. In the first place, the animals of the Great World are divided into big groups or divisions, and then these groups are divided into smaller groups, and these in turn into still smaller groups. Happy Jack and Chatterer belong to a group called the Squirrel family, and Peter and Jumper to a group called the Hare family. Both of these families and several other families belong to a bigger group called an order, and this order is the order of Gnawers, or Rodents.” Peter Rabbit fairly jumped up in the air, he was so excited. “Then Jumper and I must be related to Happy Jack and Chatterer,” he cried. “In a way you are,” replied Old Mother Nature. “It isn't a very close relationship, still you are related. All of you are Rodents. So are all the members of the Rat and Mouse family, the Beaver family, the Porcupine family, the Pocket Gopher family, the Pika family, and the Sewellel family.” By this time Peter's eyes looked as if they would pop right out of his head. “This is the first time I've ever heard of some of those families,” said he. “My, what a lot we have to learn! Is it because all the members of all those families have teeth for gnawing that they are all sort of related?” Old Mother Nature looked pleased. “Peter,” said she, “I think you ought to go to the head of the class. That is just why. All the members of all the families I have named belong to the same order, the order of Rodents. All the members have big, cutting, front teeth. Animals without such teeth cannot gnaw. Now, as you and Jumper have learned about your family, it is the turn of Happy Jack and Chatterer to learn about their family. Theirs is rather a large family, and it is divided into three groups, the first of which consists of the true Squirrels, to which group both Happy Jack and Chatterer belong. The second group consists of the Marmots, and Johnny Chuck belongs to this. The third group Timmy the Flying Squirrel has all to himself.” “Where does Striped Chipmunk come in?” asked Chatterer. “I'm coming to that,” replied Old Mother Nature. “The true Squirrels are divided into the Tree Squirrels, Rock Squirrels, and Ground Squirrels. Of course Chatterer and Happy Jack are Tree Squirrels.” “And Striped Chipmunk is a Ground Squirrel,” interrupted Peter, looking as if he felt very much pleased with his own smartness.