But Paddy the Beaver never is careless. He always chooses just the very best place. He makes sure that it is best before he begins. So now, although he was quite positive just where his house should be, he swam around the pond to make doubly sure. Then, when he was quite satisfied, he swam over to the place he had chosen. It was where the water was quite deep. "There mustn't be the least chance that the ice will ever get thick enough to close up my doorway," said he, "and I'm sure it never will here. I must make the foundations strong and the walls thick. I must have plenty of mud to plaster with, and inside, up above the water, I must have the snuggest, warmest room where I can sleep in comfort. This is the place to build it, and it is high time I was at work." With that Paddy swam over to the place where he had cut the trees for his dam, and his heart was light, for he had long ago learned that the surest way to be happy is to be busy. X PADDY STARTS HIS HOUSE Jerry Muskrat was very much interested when he found that Paddy the Beaver, who, you know, is his cousin, was building a house. Jerry is a house-builder himself, and down deep in his heart he very much doubted if Paddy could build as good a house as he could. His house was down in the Smiling Pool, and Jerry thought it a very wonderful house indeed, and was very proud of it. It was built of mud and sod and little alder and willow twigs and bulrushes. Jerry had spent one winter in it, and he had decided to spend another there after he had fixed it up a little. So, as long as he didn't have to build a brand new house, he could afford the time to watch his cousin Paddy. Perhaps he hoped that Paddy would ask his advice. But Paddy did nothing of the kind. He had seen Jerry Muskrat's house, and he had smiled. But he had taken great pains not to let Jerry see that smile. He wouldn't have hurt Jerry's feelings for the world. He is too polite and good-natured to do anything like that. So Jerry sat on the end of an old log and watched Paddy work. The first thing to build was the foundation. This was of mud and grass with sticks worked into it to hold it together. Paddy dug the mud from the bottom of his new pond. And because the pond was new, there was a great deal of grassy sod there, which was just what Paddy needed. It was very convenient. Jerry watched a little while and then, because Jerry is a worker himself, he just had to get busy and help. Rather timidly he told his big cousin that he would like to have a share in building the new house. "All right," replied Paddy, "that will be fine. You can bring mud while I am getting the sticks and grass."