sharp teeth, at work on the small trees,--then soon the falling of the trees,--then the rustling and tugging of the creatures, in getting the fallen trees out of the water,--and, finally, the surging and splashing with which they came swimming towards the ground-work of the dam, with the butt end of those trees in their mouths. The line of the dam they had begun, passed with a curve up stream in the middle, so as to give it more strength to resist the current; across the low-water bed of the river some five rods; and extended up over the first low bank, about as much farther, to a second and higher bank, which must have bounded the water at the greatest floods. They had already cut, drawn on, and put down, a double layer of trees, with their butts brought up evenly to the central line, and their tops pointing in opposite directions,--those of one layer, or row, pointing up, and those of the other, down stream. Among and under this line of butts had been worked in an extra quantity of limbs, old wood, and short bushes, so as to give the centre an elevation of a foot or two, over the lowest part of the sides, which, of course, fell off considerably each way in the lessening of the tops of the trees, thus put down. Over all these they had plastered mud, mixed in with stones, grass, and moss, so thick as not only to hold down securely the bodies of the trees, but nearly conceal them from sight. "Scarcely had I time to glance over these works, which I had not approached near enough to inspect much, before the beavers from below, and above came tugging along, by dozens on a side to the lower edges of their embankment, with the loads or rafts of trees which they had respectively drawn to the spot. Lodging these on the solid ground, with the ends just out of water, they relinquished their holds, mounted the slopes, paused a minute to take breath, and then, seizing these ends again, drew them, with the seeming strength of horses, out of the water and up to the central line on top; laid the stems or bodies of the trees parallel, and as near together as they could be got; and adjusted the butt ends, as I have stated they did with the foundation layers, so as to bring them to a sort of joint on the top. They then all went off for new loads, with the exception of a small squad, a part of which were still holding their trees in a small space in the dam, where the current had not been checked, and the other part bringing stones, till they had confined the trees down to the bottom, so that they would not be swept away. This task of filling the gap, however, after some severe struggling with the current, was before long accomplished; when those engaged upon it joined in the common work, in which they steadily persevered till this second double layer of trees, with the large quantities of short bushes which they brought and wove into the chinks, near the top, was completed, through the whole length of their dam.