Next morning Harry and his little cousin Nellie, with her doll, awaited Mary. Harry had told Nellie about his delightful ramble on the moon the evening before, and she was delighted with the stories of the man, the woman, and the toad in the moon.

"I wonder what cousin Mary will tell us about this morning," she said.

"I am going to tell you about a pretty little planet named Mars," said Mary, as she came into the room and overheard Nellie's remark. Picking up Nellie, and placing her on her knee, she began the story of Mars as follows:

STORY OF PLANET MARS.

"Next door to our own planet earth is a beautiful little world tinted with red. It has snow-white caps at the north and south poles just like our earth, and trees and flowers perhaps far prettier, for all we know. But there is not much water on Mars, because Mars is an old planet."

"How do you know it is old?" asked Harry.

"I know it is old," replied his sister, "because the older a planet is, the smaller are the seas and lakes and the amount of water on its surface. As the planet gets older and older, the water disappears, until not a drop is left. But there are wonderful canals all over Mars, and if there were boats up there, you could go all over Mars by means of these canals. When Mr. Lowell looked at Mars through his fine telescope, he not only saw the canals, but round spots where the canals meet."

"Perhaps the spots are landing-places where the captains take new passengers aboard," said Harry earnestly.

"Perhaps, Harry," said his sister, laughing; "that is, if there are any people on Mars, and captains and boats. How you would enjoy going in a yacht up and down these canals, seeing the lovely flowers and scenery on Mars, for I am sure it must be a very beautiful little world.

"It is not quite as bright on Mars as it is here, since it is farther away from the sun and only gets one-half as much light and heat. The year is also nearly twice as long and lasts six hundred and eighty-seven days, instead of only three hundred and sixty-five. Therefore, the summer season is nearly twice as long, but not nearly as warm as here."

"Then the winter must be twice as long and much colder than here," Harry said. "I do not think I should like that. But perhaps the canals freeze over in the winter time, and there may be fine skating up there?"

"No, the canals disappear altogether during the winter time," replied Mary; "or, rather, we cannot see them until they reappear again as faint dark lines in the spring-time. They get wider and wider until the summer season, then they get narrow again and disappear. Some of them are double, but the double lines we see may mean only grass and ferns on each side of a large canal fifty miles wide. When the canals double, the little round spots at the junctions of the canals darken. Perhaps these spots are like little islands in a desert, and they are covered with grass during the summer time."

"I should like to live on one of those little islands," said Harry. "Wouldn't you, Nellie?"

"If I could take my dollie with me," she replied, as she gazed at it tenderly. "And we might go for little boat-rides all around the islands. Do you think there are any little girls on Mars who have beautiful dollies like mine?"

"I really do not know," replied Mary; "but if there are any people living on Mars, I do know they are not like us. We could not live there, as there is not enough air for us to breathe. We would gasp just as that poor fish did the other day, when Uncle Robert hauled it up out of the lake and threw it into the boat. We must have air, and plenty of it, if we want to live."

"So we could not live on Mars, could we, sister?" said Harry.

"It would not be comfortable," replied Mary; "besides, it is not nearly as warm as here. Poor Uncle Robert would nearly freeze during the long winter. He would also find another surprise awaiting him if he went to Mars. Mars is a smaller world than the earth, so everything weighs less."

"Ah! I see," said Harry, clapping his hands with glee. "Uncle would not be so heavy on Mars. How glad he would be to go there! Poor Uncle Robert! He is so heavy he just shakes the house when he walks across the floor. Next time I see him I shall say: 'Go to Mars, Uncle Robert, and see what will happen to you there.' How much would he weigh on Mars?"

"He weighs two hundred and forty pounds here, and would weigh only ninety pounds there, and you would weigh only thirty pounds. So I could pick you up, couch and all, and carry you as easily as Nellie carries her doll in its doll-carriage."

"Then dollie would weigh nothing at all," said Nellie, looking at her doll curiously.

Harry looked puzzled, and after thinking a moment, he said to his sister:

"I cannot see why I would weigh less if I went to Mars."

"Because the planet being smaller than the earth, it has less power to attract you and to hold you down to its surface. The earth is like a great magnet, and if there were not something drawing us to it and keeping us there, we would be greatly puzzled. Tables and chairs would not stand firm, and we would stagger about for want of weight, just as when a diver tries to walk in deep water. He has to have heavy weights fastened to him so as to keep him in place. A stone that would be quite heavy on earth would weigh only a few ounces on Mars. Nellie could carry this large rocking-chair I am sitting in and eight or ten dollies as well. Do you remember seeing the men at the circus jumping over bars five feet high? Well, on Mars they could jump fifteen feet, while the clumsy old elephant we saw there would probably be as graceful and nimble as a deer."

"How would football be on Mars?" asked Harry.

"Very unlike football here, dear. A good kick would send the ball much farther than here."

"Is Mars very far away?" asked Nellie. "If we could go there in a train, would it take us ever so long going?"

"About sixty years," said Mary, laughing, "if the train went a mile a minute. If you tried to walk it, going four miles an hour and ten hours a day, it would take you more than two thousand years to get there. So, I don't think we can take that trip, little girl, can we? But let us call on the next-door neighbor or neighbors to Mars, for there are about four hundred and fifty of them."

STORY OF THE BABY PLANETS.

"Four hundred and fifty little worlds?" asked Harry.

"Where can there be room for them all, and don't they knock against each other in the sky?"

"No, there is plenty of room for them up there. Besides, they are so small, some of them being only ten miles wide."

"Why, Uncle Robert walked ten miles the other day," said Harry; "he could walk all around those little worlds. And if they are so little, I suppose he would weigh scarcely anything at all if he lived on one of them. I should think he would be almost like the giant with the seven-league boots. Don't you remember, Nellie, you were reading about him the other day. Poor little Jack the Giant Killer would not have much chance there, but perhaps he could fly if he weighed so little. And how would football be on these little worlds?"

"You might give the ball such a kick that it would leave the planet altogether and circle around the sun as a planet on its own account."

How Harry and Nellie laughed at the idea of a football circling around the sun as a planet!

"And is this really true?" inquired Harry. "Why, this is better than any fairy story I ever heard. Now, tell me some more. Don't you think we might be able to fly on these tiny worlds?"

"If you could get someone to make you a pair of wings up there, it would be quite easy to fly. Our bodies would only weigh a few pounds, so we ought to be able to flap a pair of wings strong enough to keep us flying. That is, if the air around these little worlds is as dense as ours."

"Don't I wish I lived there, then," said Harry regretfully, "because it would not matter about my being lame. And I could put on my wings whenever I wanted to see you, Nellie, and fly across the park, and way, way up into the sky, and——"

"Oh, don't! Harry," said Nellie, throwing her doll on the ground and catching hold of her cousin in dismay; "if you go you must take me with you too. And poor little dollie," she continued, suddenly remembering her precious charge, "and Cousin Mary and Uncle Robert and Aunt Agnes and everybody in the world. What would we do if you flew away from us?"

"But I can't," said Harry, laughing at her dismay; "and it's just like a little girl to think I would go and leave her all alone. No, we'll all go some day, won't we?" he continued, turning to his sister Mary; "and we'll be with the angels—and have wings. You and Nellie and I—why, we will all fly, and I shall forget I ever was lame on planet earth then."

"And will father have wings, too?" asked Nellie curiously. "He will want a very big pair, something like the big eagle's down at the aquarium."

"Will he, you little rogue?" exclaimed the loud, good-natured voice of her father, as he appeared on the scene. "So this is where you are, and I have been looking for you all over the house and grounds."

"I told nurse I would be back in a minute," she replied.

"A minute!" said her father, laughing heartily; "why, you have been here nearly an hour. So you want your father to have wings, do you, you little rogue! Wait till I show you how you would fly if you had wings." The next moment he put her up on his shoulder, dollie and all, and ran with her across the meadow at full speed, while she laughed merrily and clapped her hands with delight.

"So the party is broken up," said Harry's nurse, who came to look after her charge.

"Yes; one of the audience has flown," said Harry, laughing.

"And I must fly, too," said Mary, as she kissed Harry lovingly. "And I shall tell you about the rest of Giant Sun's family to-morrow. Good-by."