Jimmie and Daisy, and Baby Dot were all staying for their holidays at pleasant Sandown, in the Isle of Wight, and a fine time they were having. The mornings were spent in building castles and digging wells on the broad, yellow sands, and, when not too hot, the afternoons frequently passed in like manner; while in the cool sun-setting time after tea, their father always took them for a nice walk over the cliffs to Shanklin, or along the country lanes to Yaverland, or away to some lovely inland meadow where they could pick big white marguerites and golden buttercups as many as their hands could hold.

One morning Daisy was busily looking for nice pieces of seaweed and pretty little stones to ornament a grotto she and Jimmie had built, when she heard him calling, "Daisy! Daisy! You don't know what I've got!"

Of course she ran to look, and found Jimmie on his knees, watching with great interest the movements of a tiny crab, who seemed to have come out for a walk without his mother, and lost his way.

"Poor little thing!" said tender-hearted Daisy. "It doesn't like the hot sun. Let's put it in some cool, shady place, where the sea will come up to it."

"I'm going to take it home with me," answered Jimmie.

"What for? You haven't got a 'quarium."

"To play with, of course."

"Oh, Jimmie, it won't like that!" cried Daisy, in real anxiety. "It wants to be in the water. You don't know how to feed it, or anything, and it'll die!"

"No, it won't. You're silly—you're only a girl, and you're frightened of it. I know!" said Jimmie scornfully.

"I'm not afraid of it one bit!" Daisy protested. "I'd pick it up with my fingers. But I'm sure it must be frightened of you. Oh, Jimmie, do let me put it in the sea again, there's a dear, good boy!"

Jimmie, however, lest he should lose his prize, caught it up in a twinkling, and stuffed it in his pocket. "You go there!" he said. "And if you nip, I'll pay you!"

Daisy's distress was evident, and tears were gathering in her blue eyes; for she knew that everything which has life has feeling too, and she could not bear to have even a baby crab made uncomfortable. But Jimmie, I am sorry to say, was not so tender over her, nor enough of a man to give up his own way in a little thing to make his sister happy. So, in spite of her entreaties, poor wee crabbie was condemned to durance vile in the hot and stifling pocket of Jimmie's knickerbockers, and Daisy had a sorry spot in her heart for the rest of the morning.

When the children went indoors they found that their favorite uncle had arrived from London, and was proposing an early dinner, and a trip to Carisbrooke. In the pleasant excitement which this caused, everything else was forgotten. Even when Jimmie's suit was changed, he never gave one thought to the captive crab.

Their excursion to the old castle proved delightful. Jimmie, who had only got as far as Richard II. in his history-book, and was not very fond of learning, became quite eager to get on fast, and come to the place where it told about King Charles and his imprisonment, and how he tried to get out of the tiny window shown them by the guide. Somebody remarked that "Liberty is sweet," and Jimmie remembered writing the very same in his copy-book; but it did not occur to him to consider that it is just as sweet in its way, to a little, sea-loving crablet as to a king.

It must have been the unusual state of excitement in which Jimmie went to bed that night that caused the events of the day to become oddly mixed up in a horrible dream. He thought he was a prisoner, not in a castle, but in the sand grotto which he and Daisy had been making in the morning, and that his jailor was a giant crab! A tiny hole in the side of the grotto, about two inches square, was his only way of escape, and unless he could manage to squeeze himself through that, he would be crushed to death by a pair of great claws as thick as a man's body. Nearer and nearer they came, harder and harder he struggled, and gurgled and gasped. No wonder that at last his cries aroused his mother in the next room, and that she came running to see what was the matter!

"Oh, that awful crab! Save me, save me! Oh—oh—oh!" yelled Jimmie, only half awake. And then to his increased horror he found that his dream was at least partly real, and that his own escaped prisoner was crawling briskly over his pillow in the evident hope of finding the ocean somewhere down on the other side. Having the creature come upon him like that when he least expected it, and immediately after such a dream, Jimmie fairly screamed with fright, and wouldn't lie down in bed again until Daisy, who had been awakened by the commotion from a lovely dream about the dear Carisbrooke donkey who works at the well, came and fetched the wandering crustacean away, and put it among a lot of damp seaweed in her tin pail, where it seemed very glad to stay.

First thing in the morning, before breakfast, Jimmie carried the poor little creature down to the shore, and left it at the edge of the waves. Moreover, he could not help thinking it very sweet of Daisy that she never once said, "Served you right," and he privately made up his mind that another time if she very much wanted him not to do a thing, he wouldn't do it.