Whitefoot the Wood Mouse and Danny Meadow Mouse had become so interested that they they couldn't afford to miss the next lesson. Neither did either of them feel like making the long journey to his home and back again. So Whitefoot found a hole in a near by and decided to camp out there for a few days. Danny decided to do the same thing in a comfortable place under a pile of brush not far away. So the next morning both were on hand when school opened.  
“I told you yesterday that I would tell you about some of Danny's cousins,” began Old Mother Nature just as Chatterer the Red Squirrel, who was late, came hurrying up quite out of breath. “Way up in the Far North are two of Danny's cousins more closely related to him than to any other members of the Mouse family. Yet, strange to say, they are not called Mice at all, but Lemmings. However, they belong to the Mouse family.
 
“Bandy the Banded Lemming is the most interesting, because he is the one member of the entire family who changes the color of his coat. In summer he wears beautiful shades of reddish brown and gray, but in winter his coat is wholly white. He is also called the Hudson Bay Lemming.
 
“Danny Meadow Mouse thinks his tail is short, but he wouldn't if he should see Bandy's tail. That is so short it hardly shows beyond his long fur. He is about Danny's size, but a little and stockier, and his long fur makes him appear even thicker-bodied than he really is. He has very short legs, and his ears are so small that they are quite hidden in the fur around them, so that he appears to have no ears at all.
 
“In that same far northern country is a close relative called the Brown Lemming. He is very much like Bandy save that he is all brown and does not change his coat in winter. Both have the same general habits, and these are much like the habits of Danny Meadow Mouse. They make short in the ground leading to , warm nests of grass and . In winter they make little tunnels in every direction under the snow, with now and then an opening to the surface.
 
“There are many more Brown Lemmings than Banded Lemmings, and their little paths run everywhere through the grass and moss. In that country there is a great deal of moss. It covers the ground just as grass does here. But the most interesting thing about these Lemmings is the way they migrate. To migrate is to move from one part of the country to another. You know most of the birds migrate to the Sunny South every autumn and back every spring.
 
“Once in a while it happens that food becomes very scarce where the Lemmings are. Then very many of them get together, just as migrating birds form great flocks, and start on a long journey in search of a place where there is plenty of food. They form a great army and push ahead, regardless of everything. They swim wide rivers and even lakes which may lie in their way. Of course, they eat everything eatable in their path.”
 
“My!” exclaimed Danny Meadow Mouse, “I'm glad I don't live in a country where I might have to make such long journeys. I don't envy those cousins up there in the Far North a bit. I'm satisfied to live right on the Green Meadows.”
 
“Which shows your good common sense,” said Old Mother Nature. “By the way, Danny, I suppose you are acquainted with Nimbleheels the Jumping Mouse, who also is rather fond of the Green Meadows. I ought to have sent word to him to be here this morning.”
 
Hardly were the words out of Old Mother Nature's mouth when something landed in the leaves almost at her feet and right in the middle of school. Instantly Danny Meadow Mouse under a pile of dead leaves. Whitefoot the Wood Mouse into a knothole in the log on which he had been sitting. Jumper the Hare behind a little tree. Peter Rabbit bolted for a hollow log. Striped vanished in a hole under an old stump. Johnny Chuck backed up against the trunk of a tree and made ready to fight. Only Happy the Gray Squirrel and Chatterer the Red Squirrel and Prickly Porky the , who were sitting in trees, kept their places. You see they felt quite safe.
 
As soon as all those who had run had reached places of safety, they peeped out to see what had frightened them so. Just imagine how very, very foolish they felt when they saw Old Mother Nature smiling down at a little fellow just about the size of little Whitefoot, but with a much longer tail. It was Nimbleheels the Jumping Mouse.
 
“Well, well, well,” exclaimed Old Mother Nature. “I was just speaking of you and wishing I had you here. How did you happen to come? And what do you mean by scaring my pupils half out of their wits?” Her eyes twinkled. Nimbleheels saw this and knew that she was only pretending to be severe.
 
Before he could reply Johnny Chuck began to . The chuckle became a laugh, and presently Johnny was laughing so hard he had to hold his sides. Now, as you know, laughter is . In a............