[Illustration: Meadow Beaver Colony Water level in canal 3 feet higher than level in pond Canal 15 inches deep 30 inches wide, 70 feet long Aspen grove 120 feet from house. Willows grass aspen grove where food is obtained Canal dug in meadow formed by silt and sediment filling old beaver pond A Beaver Canal] A buried log in the canal was gnawed in two and removed. The canal curved around a boulder too large to be removed. At a distance of eighty-one feet from the lower end the canal-builders came in contact with granite rock and brought the canal to a stop by enlarging the upper end into a basin about ten feet across. The entire length of this canal was through the sediment of a former beaver pond. After making a pond beavers must occasionally raise the height of the dam to deepen the water, and also dredge the mud from the bottom. But despite both dredging and dam raising, the pond sooner or later fills with sediment and has to be abandoned. In due time it is overgrown with grass or a forest. Food shortage--complete exhaustion of the aspen growth--had compelled the abandonment of the Meadow Colony after it had been a beaver settlement for a great many generations. Two large ponds, a dozen smaller ones, and three houses were left to their fate. Most of the smaller ponds were completely lost, being overgrown with willows. Two of the houses had crumbled and were now low wild flower beds. Since abandonment a number of aspen groves had grown, and although these were some distance from the stream, they could be reached and would furnish necessary food supply. These settlers had come from about ten miles down stream. During summer vacations beavers make long rambling journeys. It may be that some of these beavers had visited this old colony and knew of its opportunities before coming to settle. From time to time during evenings I had glimpses of several of the beaver settlers. From their appearance and from their footprints they were mostly young beavers. During the autumn I several times dimly saw them playing in the twilight. They splashed merrily about in the pond, the entire colony taking part. With mud and willows the beavers repaired the breaks in the but-little-damaged dam of the old pond. Then they cut a ditch thirty or forty feet long through a ridge to a little pond to the north, and filled the old large pond. Its waters extended to within twelve or fifteen feet of the lower end of the canal. But as the canal was nearly two feet higher than the surface of this pond, water for the canal would have to come from a higher source, and I was puzzled as to where this might be. But beavers plan their work two or three moves ahead, and they probably knew what they were about.