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THE AMERICAN BEAVER. 



immediately against, or slightly above each lodge. 

 There is a strong current, at such times, in Carp River 

 below dam No. 30, and in the Esconauba below dam 

 No. 13. On the other hand, these brush piles are 

 rarely, if ever, found connected with lodges situated 

 upon the margins of ponds formed by dams across 



Fig. 21. 



Brush-heap near Lodge. 



small brooks, or near island lodges in large ponds, 

 or near the lake lodges. In the ponds of the small 

 streams there is little or no current, and none that 

 is perceptible in the small lakes. As a confirm- 

 ation of the supposed relation between these currents 

 and the brush heaps, the latter were found con- 

 nected with all of the lodges on the Carp below the 

 point named, while none were to be seen near the 

 lodges in Grass Lake, nor in the pond at the Long 

 Dam, nor at any of the lake lodges. The same is 



