At last he was ready to stake out the ground and start digging for the foundation. It was a great moment for him when the workmen put their spades to the ground to clear away the first layer of earth. They began the digging and foundation-laying on the east side, which was nearest the house. There all went well; the ground was firm and the stones stayed where they were put. But when they came to lay the stones on the west side, which gave on the field, they found that there had been a terrible miscalculation. They had not gone very deep before they came upon soft blue-clay, into which the stones sank and disappeared. The Lieutenant had made the grave mistake of not having the ground tested. But now that the foundation had been laid on one side, he thought it best to go on with the building in the place he had staked out. An old mason advised him to put the barn farther up toward the hill, as blue clay was treacherous stuff to build on. The Lieutenant would not hear of that. It would be all right, he said, to lay the foundation on blue clay; there must be a bottom even to that. As for stone to fill it in, well--there was the whole mountain range to take from. Load after load of stone was dumped on to the clay and before long he had a wide stone dam there--solid and steady as could be--on which it seemed safe enough to lay a foundation. Then, one day, came a couple of heavy showers, and all at once cracks appeared in the dam. The next morning it began to sink, and in a few hours it was completely swallowed up. But all summer the Lieutenant went on dumping stone into the clay, and when by autumn it was still uncertain whether the foundation would hold, he decided to put off the masonry work till the following year, in order to see how the blue clay would behave in the spring, when the frost was out of the ground. As soon as the snow was gone, the Lieutenant went down to have a look at his wall. Yes, it was still there, no cracks in it. But then the regular spring thaw had not begun. Every day, and many times a day, he went down to see how things were going. The wall remained intact, and the ground seemed now to be free of frost, so he ventured to send word to the master mason to come with his journeymen, and begin work. They put up the walls on the north and east sides first, so as to give the insecure foundation on the west side time to settle. The latter part of June they began work on the doubtful side, and by the middle of July, when they had got almost up to the coping, they noticed some cracks in the wall. Then, all at once, the wall began to sag, and several layers of brick had to be torn down quickly, lest the whole wall give way.