up on its hind legs like a kangaroo, and having very strong fore-arms, with which it clutches a small tree. This is the skeleton we see now. It could have packed you away inside it and never known you were there; but, luckily for the children who lived on earth when it did (if there were any), it did not eat flesh, but only the leaves of trees and other vegetable things. It was called the giant ground sloth, and, as you may judge from this name, was not very quick in its movements. It was not found in England, but in South America, and there are now no more like it in existence; and if we had not got its skeleton we should never have known it had lived at all. There were many other curious creatures on earth then--some that lived in the water and had long necks like snakes, and fat bodies, and others like enormous lizards. There was also a big bird, bigger even than the ostrich, this you can see in a case near the sloth. Then in the centre of the room is the tall skeleton of a very, very big stag, which is to other stags as a giant would be to you. He is the Irish elk, and his skeleton was found in the peat bogs of Ireland; he must have been a magnificent creature to look at when alive, with his proud, free head and branching horns. Passing through the hall, we see three or four cases showing examples of the different colours of animals--the white ones among the snow, and the yellow ones on the sand, the protective colouring of which we spoke before; and on the staircase sits a statue of Darwin, the wonderful man who found out this about animals, and also many other wonderful things, and made us see animal life in altogether a new way. When you are a little older you will find many things of great interest in Darwin's books. Upstairs on one side is a gallery full of humming-birds, tiny birds some of them, no bigger than butterflies, and as brilliant as jewels, red and blue and green and yellow. It must be wonderful to see them flashing about in their native land and hovering over the gorgeous flowers; but here, so many together in one case, they lose half their beauty, and they lack the sunshine to bring out their lovely colours. There is also a gallery full of pressed flowers, and here you can learn anything about flowers, leaves, and seeds; and on the other side there is one full of stuffed animals. Now, we have seen the living animals at the Zoo, and we do not care to see the dead ones here so much, though we can just glance around it. But there is one animal you must see, because there is no living animal like it in the Zoo.