"If we are going to build a straight one, we guide two of the largest trees that we have felled to the spot we have chosen, placing them side by side, and leaving a space between. If some of their branches make them lie too high for our purpose, we nibble these off, working under water quite easily, and coming up every few minutes to breathe. (No--not more often than that, I assure you. Nature has arranged this for us, so that we can more easily escape our enemies.) These branches we place vertically in front of the big logs, adding other branches and small trees in the same way. Most of our wood, however, we lay crosswise, and almost horizontally. The spaces in between are filled with mud and stones, which we mix together to form a kind of cement. We bring the mud in tiny handfuls, holding it under our throats by means of our forepaws, and often making as many as a thousand journeys backward and forward from the bank before we have enough. We always build by night, you know, and for a long time no man could say just how we worked. Perhaps the Night Wind told in the end." "How do you manage when you want your dam to be curved, as this one is?" asked Phil. "Then we use smaller logs in the same way, shaping the dam as we work. You would not believe the strength of ours, unless you saw how it stood the shock of the floating ice as it came pounding against it at the end of the winter. Our houses we build in much the same way, but more roughly." "I think they're wonderful," said Phil respectfully, and Father Beaver, trying not to look too pleased, moved his flat tail and cried "Tut, tut!" "The Night Wind told me a wonderful story the other day--that some eight or nine years ago an Englishman took some Social Beavers to a beautiful valley in his park in England, setting them free by the banks of a stream, where the trees grew thickly down to the very edge of the water, just as they do here. These Beavers, she says, set to work at once to build a dam across the stream, making a deep wide pool six times as large as the original brook, and six times as deep at the lower end." "I wonder if it is true?" mused Phil "I believe anything that the Night Wind tells me," said Father Beaver, thoughtfully. "She talks to us often when the sun goes down; sometimes she is merry, and sometimes sad, but always what she says is true. She brings the scent of the hunters in time to warn us that they are on our track; she knows when the frosts are coming, and when it is safe for us to leave our winter houses and take to the woods. For Nature often sends us messages through her. Of what are you thinking? Eh?" Phil's thoughts had been wandering, and the Beaver's sharp eyes had found him out. "I was thinking about that Otter," he said, truthfully. "I want to know how an Otter looks."