"I have found a lovely little yellow one," cried Helen.

"So have I, and a black one," said Johnny.

Louisa also found a few; but, after searching some time, they had only collected a small number, and these nearly all yellow; so they gathered round their mama, who was all this time sitting reading on a block of wood, with Neptune and Spot by her side, and asked her what they should do for shells. The house, they declared, would be nothing without the pretty grotto, and they could scarcely find any.

Just at that moment there came towards them a boy who carried a flat board slung round his neck covered with beautiful large shells; he came up to their mama, asking her to buy some.

"O how lovely!" cried Helen.

"But they are too large for the grotto," said Johnny.

The boy said he had plenty of smaller ones, which he sold by the pint; and, setting down his board, he took a canvas bag out of his pocket, which was full of all sorts of common shells, white, yellow, pink, and black. These were exactly what the children wanted, and their mama bought a pint for them.

"But where do you find all these?" asked Helen. "We could see none almost, but a few little yellow ones."

The boy said he came from Pegwell Bay, where there were numbers of them; but he added, he did not find the large ones there. They came from foreign parts, and were brought home by his father, who was a sailor. "Would not the lady please to take one?" he said. He had slung on his board again, and held one in his hand towards her as he spoke. She bought two, and gave him the price he asked; and, after thanking her, he went on.

The grotto was now commenced in good earnest. A layer of stones was first put down, and then the shells raised on it, the largest at the bottom. It took a good while to sort them into different sizes and colours, and then to produce the proper effect by arranging them well. At last, nearly the whole collection had been used up, and the grotto was rising to a peak at the top, when they were startled by a most unexpected event. A wave, pushing on before its companions, sent a pointed flood of water into the midst of their garden, and, rolling back, left their pond full. They had not observed, in their eagerness over their work, that the tide had risen fast, and that their house and garden now stood at the very edge of the sea. They started up; but, while they stood staring in consternation, on came another wave, swept away the grotto, and carried the shells back with it. Scarcely, however, was there time to feel the misfortune, when another, rolling on, brought them back, and laid them at their feet.