Nor had she any such treacherous intention. So soon as ever the dinner-things were cleared away, Granny Marrable with her own hands lifted down the model off of the mantelshelf, and removing the glass from the front of the case, brought the contents out on the oak table the cloth no longer covered, so that you might see all round. Then the cistern--which after all had nothing to do with Sister Nora--was carefully filled with water so that none should spill and make marks, neither on the table nor yet on the mill itself, and then it was wound up like a clock till you couldn't wind no further and it went click. And then the water in the cistern was let run, and the wheels went round; and Dave knew exactly what a water-mill was like, and was assured--only this was a pious fiction--that the water made the wheels go round. The truth was that the clockwork worked the wheels and made them pump back the water as fast as ever it came down. And this is much better than in real mills, because the same water does over and over again, and the power never fails. But you have to wind it up. You can't expect everything! Granny Marrable gave a brief description of the model. Her brother, who died young, made it because he was lame of one leg; which meant that enforced inactivity had found a sedentary employment in mechanisms, not that all lame folk make mills. Those two horses were Mr. Pitt and Mr. Fox. That was her father standing at the window, with his pipe in his mouth, a miracle of delicate workmanship. And that was the carman, Mr. Muggeridge, who used to see to loading up the cart. Children are very perverse in their perception of the relative importance of things they are told, and Dave was enormously impressed with Mr. Muggeridge. Silent analysis of the model was visible on his face for awhile, and then he broke out into catechism:--"Whoy doesn't the wheel-sacks come down emptied out?" said he. He had not got the expression "wheat-sacks" right. "Well, my dear," said Granny Marrable, who felt perhaps that this question attacked a weak point, "if it was the mill itself, they would. But now it's only done in small, we have to pretend." Dave lent himself willingly to the admission of a transparent fiction, and it was creditable to his liberality that he did so. For though the sacks were ingeniously taken into the mill-roof under a projecting hood, they reappeared instantly to go up again through a hole under the cart. Any other arrangement would have been too complex; and, indeed, a pretence that they took grain up and brought flour down might have seemed affectation. A conventional treatment was necessary. It had one great advantage, too: it liberated the carman for active service elsewhere. It was entirely his own fault, or his employer's, that he stood bolt upright, raising one hand up and down in time with the movement of the wheels. The miller did not seem to mind; for he only kept on looking out of window, smoking.