118 THE AMERICAN BEAVER. 



There are two dams on the outlet connecting Lake 

 Flora with Lake Mary, which are numbered 2 and 3 on 

 the map. Of these the lower one is an ordinary dam, 

 apparently constructed to strengthen the one above. 

 The upper one is situated about six rods down the out- 

 let from Lake Flora, and is a large and remarkable 

 structure. It is two hundred and three feet in length, 

 with a nearly uniform height of three feet from one 

 end to the other, and with a lower face of stick and 

 pole work, ranging from six to nine feet in length, 

 measured on its slope. The difference in level in the 

 waters above and below the dam, at the thread of the 

 outlet, is three feet ; but, as the dam below sets back 

 the water about two feet deep at this point, the verti- 

 cal height of the structure here is five feet and over. 

 From these measurements an impression is afforded 

 of the large amount of solid materials this dam con- 

 tains. Although inferior to the Grass Lake dam, it 

 compares with it not unfavorably. The size of Lake 

 Flora is materially enlarged by this barrier across 

 its outlet, since it raised the water joermanently from 

 two and a half to three feet. This dam, with its ap- 

 purtenances, was the possession, among other proprie- 

 tors, of the beaver whose skeleton is represented in 

 the plate. She was caught upon it in the year 1862, 

 while in the act of repairing a breach made by the 

 trapper, a few days before I visited and measured the 

 work. The great amount of materials contained in 

 this structure is shown by the unusual width of its 

 crest or summit, which presupposes a corresponding 

 transverse width at its base. 



