I did," said Caleb. "That makes no difference. You did not say you _thought_ you hung it up, but that you were sure you did." "Well, I certainly thought I did," said Caleb; "and I am sure it wasn't a lie." Dwight insisted that it was, and Caleb determined to ask his grandmother. They returned to the mole. It was not long after this, that David, on looking towards the house, called out that his mother was coming. It was true. She put on her bonnet, and was coming slowly down to the brook, to see how the boys got on with their work. They were rejoiced to see her coming. They took Caleb's chair, and laid it down upon its side, and then put one of the side-pieces of the wheelbarrow upon it with the clean side up; and this made quite a comfortable seat for her, though it was a little unsteady. She sat down upon it, and made a good many enquiries about their plan and the progress of the work. "Well, boys," said she, "that is a capital plan, and you will have a great eddy above your mole." "An eddy!" said Dwight, "what is that?" "Why, the water coming down, will strike upon the outer end of your mole, and be turned in towards the shore, and then will go round, and will come into the stream again. There, you can see it is beginning to run so already." So the boys looked above the mole, and they saw the little bubbles that were floating in the water, sailing round and round slowly, in a small circle, between the upper side of the mole and the shore. "When you get it built away out," said Madam Rach