At last the new wasp eats off the lid, and comes out, a full-grown wasp. Wasps work hard all the time. They fly about for food, and for stuff to make paper, wax, and varnish and glue. They have homes to build, and little wasps to rear. They seem to know they must nearly all die, when frost comes. When the cold begins, the old wasps look into the cells. They kill all the eggs, grubs, and half-grown wasps that they find there. Why do they do that? Do they not seem to love the baby wasps? Yes. They kill them quickly to keep them from dying of hunger and cold. Is not that a queer way to show love? Some wise people do not feel sure that the wasps kill the little ones in this way. Do not forget that the wasp does not grow after it gets its wings and leaves its cell. When it comes out it is full grown. When it is a fat, round, wingless grub it is called a larva. When it has changed its shape, and has wings, it is called a pupa. Some call the pupa a nymph. Are those very hard words? LESSON XV. MRS. WASP AT HOME. There are many kinds of wasps. There are mud-wasps, which make mud houses. Lonely wasps build alone in the ground, and dig holes in the sand. They throw the sand back between their hind legs. [Illustration: ROCK-A-BYE BABY.] Did you ever see your dog dig a hole? The wasp digs in the same way as the dog. Sand wasps make tiny earth houses on walls and fences. Tree wasps hang great paper houses upon the branches or twigs of trees. Rust-red wasps do not build houses for their cells. They make fine paper cells, and hang them with the open part down, in some safe place. They varnish the cells to keep them dry. In a cold land, the wasps build in barns, attics, hollow trees, or in the ground. In warm lands, they hang a bunch of cells out in the open air, on trees or vines. One day I found a wasp’s nest in an old tin can. There had been paint in the can. The wasp had made a stem of paint. She used her feet to twist it into a stiff rope. Upon that, for a stem, she built a nest like a white flower. She put a cell upon the stem, and six cells around that one. In each cell was a wee, white egg. The eggs grew to fat grubs. They had black heads. Then Mrs. Wasp fed them. She went from one cell to the other, and fed her grubs, just as a bird feeds its young. Mrs. Wasp also makes a pap of bugs and fruit, and gives it to her young. Wasps are very neat. They keep their nests clean. They use cells more than once. But they make new nests each year. One kind of wasp is called the White Face. Every wasp has a clean, shining coat, and a fierce look. Wasps do not bite or chew food; they suck out the juices of fruit and insects. LESSON XVI. REVIEW. Where, and how, does Mr. Crab make his house? Where are Mr. Crab’s bones? Where are yours? Will you tell me how Mr. Crab gets on his new coat? Tell me some of the kinds of crabs that you know of. What do crabs eat?