“The queerest-looking member of the family is the Hooded Seal. Mr. Seal of this branch of the family is rather large, and on top of his nose he carries a large bag of skin which he can fill with air until he looks as if he were wearing a queer hood or bonnet. “The Seals complete the list of animals which live mostly in the water but come out on land or ice at times. Now I will tell you of a true mammal, warm-blooded, just as you are, and air-breathing, but which never comes on land. This is the Manatee or Sea Cow. It lives in the warm waters of the Sunny South, coming up from the sea in the big rivers. It is a very large animal, sometimes growing as big as a medium-sized Walrus. The head is round, somewhat like that of a Seal. The lips are thick and big, the upper one split in the middle. The eyes are small. It has but two flippers, and these are set in at the shoulders. Instead of hind flippers, such as the Seals and Sea Lions have, the Manatee has a broad, flattened and rounded tail which is used as a propeller, just as fish use their tails. The neck is short and large. In the water the Manatee looks black. The skin is almost hairless. “This curious animal lives on water plants. Sometimes it will come close to a river bank and with head and shoulders out of water feed on the grasses which hang down from the bank. The babies are, of course, born in the water, as the Manatee never comes on shore. Now I think this will end to-day's lesson and the school.” Peter Rabbit hopped up excitedly. “You said that the largest animals in the world live in the sea, and you haven't told us what they are,” he cried. “True enough, Peter,” replied Old Mother Nature pleasantly. “The largest living animal is a Whale, a true mammal and not a fish at all, as some people appear to think. There are several kinds of Whales, some of them comparatively small and some the largest animals in the world, so large that I cannot give you any idea of how big they are. Beside one of these, the biggest Walrus would look like a baby. But the Whales do not belong just to this country, so I think we will not include them. “Now we will close school. I hope you have enjoyed learning as much as I have enjoyed teaching, and I hope that what you have learned will be of use to you as long as you live. The more knowledge you possess the better fitted for your part in the work of the Great World you will be. Don't forget that, and never miss a chance to learn.” And so ended Old Mother Nature's school in the Green Forest. One by one her little pupils thanked her for all she had taught them, and then started for home. Peter Rabbit was the last. “I know ever and ever so much more than I did when I first came to you, but I guess that after all I know very little of all there is to know,” said he shyly, which shows that Peter really had learned a great deal. Then he started for the dear Old Briar-patch, lipperty-lipperty-lip.