ENGINEERING.

When Caleb awoke it was almost evening. The rays of the setting sun were shining in at the window. Caleb opened his eyes, and, after lying still a few moments, began to sing. He thought it was morning, and that it was time for him to get up. Presently, however, he observed that the sun was shining in at the wrong window for morning: then he noticed that he was not undressed; and, finally, he thought it must be night; but he could not think how he came to be asleep there at that time.

Caleb went out into the parlour. David and Dwight were just putting the chairs around the tea table. At tea time, the boys talked a good deal about the mole, and they asked Mary Anna if she would help them rig some vessels to sail in the Maelstrom.

“Sail in the Maelstrom!” said Mary Anna; “whoever heard of sailing in the Maelstrom? That is a great whirlpool, which swallows up ships; they never sail in it. You had better call it the Gulf Stream.”

“Well,” said Dwight, “we will; and will you help us rig some vessels?”

“Yes,” said Mary Anna, “when you get the mole done.”

Mary Anna was a beautiful girl, about seventeen years old, with a mild and gentle expression of countenance, and very pleasant tone of voice. She helped the children in all their plays, and they were always pleased when she was with them. She had great stores of pasteboard and coloured papers, to make boxes, and portfolios, and little pocket-books, and wallets of; and she had a paint-box, and pencils, and drawing-books, and portfolios of pictures and drawing lessons.

She rigged the boys' vessels, and covered their balls, and made them beautiful flags and banners out of her pieces of coloured silk. She advised them to have a flag-staff out at the end of the mole, as they generally have on all fortifications and national works. She told them she would make them a handsome flag for the purpose.

After tea she went down with them to see the works. She seemed to like the mole very much. The whirlpool was moving very regularly, and she advised them to build the mole out pretty far.

“Yes,” said Dwight; “and we are going to have a piece across up and down the stream, at the end of it, so as to make a T of it.”

“I think you had better make a Y of it,” said Mary Anna.

“A Y!” said Dwight, “how?”

“Why instead of having the end piece go straight across the end of the mole, let the two parts of it branch out into the stream, one upwards and the other down.”

“What good will that do?” said David.

“Why, if you make it straight like a T, the current will run directly along the outer edge of it, and so your vessels will not stay there. But if you have it Y-shaped, there will be a little sort of harbour in the crotch, where your vessels can lie quietly, while the current flows along by, out beyond the forks.”

“That will be excellent,” said Dwight, clapping his hands.

“And besides,” said she, “the upper part of the Y will run out obliquely into the stream, and so turn more of the current into your eddy, and make the whirlpool larger.”

“Well, and we will make it so,” said David; “and then it will be an excellent mole.”

“Yes,” said Mary Anna, “there will be all sorts of water around it;—a whirlpool above, a little harbour in the crotch, a current in front, and still water below. It will be as good a place for sailing boats as I ever saw.”

But the twilight was coming on, and they all soon returned to the house.

Madam Rachel had a little double-bedroom, as it was called, where she slept. It was called a double-bedroom, because it consisted, in fact, of two small rooms, with a large arched opening between them, without any door. In one room was the bed, which moved in and out on little trucks, for Caleb. In the other room was a table in the middle, with books and papers upon it. There was a window in one side, and opposite the arched opening which led to the bedroom was a small sofa.

Now, it was Madam Rachel's custom every evening, before the children went to bed, to take them into her bedroom, and hear them read a few verses of the Bible; and then she would explain the verses, and talk with them a little about what had occurred during the day, and give them good advice and good instruction. At such times the children usually sat upon the sofa, on one side of the table, and Madam Rachel took her seat on the other side of the table, in the chair, so as to face them. The children generally liked this very much; and yet she very seldom told them any stories at these times. It was almost all reasonings and explanations; and yet the children liked it very much.

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