height of the water. This wall or buttress is after 

 all but a dam, and like most dams it is built for 

 the purpose of raising and maintaining the level 

 of water. 



Extending at right angles westward from the 

 end of the old canal was a newer one of two 

 hundred and twenty-one feet. A wall separated 

 and united the two. One hundred and sixty feet 

 of this new canal ran along the contour of a hill, 

 approximately at a dead level. Then came a wall, 

 and from this the last sixty-one feet extended 

 southward up a shallow ravine. In this part there 

 were two walls. The upper end of the sixty-one- 

 foot extension was nine feet higher than the 

 house, and four hundred and twenty-eight feet dis- 

 tant from it. The two-hundred-and-twenty-one- 

 foot extension was from twenty-six to thirty-four 

 inches wide, and averaged twenty-two inches 

 deep. The entire new part was supplied with 

 spring water, which the beaver had diverted from 

 a ravine to the west and led by a seventy-foot 

 ditch into the upper end of their canal. Thirty 

 feet from the end of the canal were two burrows, 

 evidently safe places into which the beaver could 

 no 



