148 THE AMERICAN" BEAVER. 



are but two, both of which are upon grass islands 

 within the pond. There are none upon its banks. 



Another, and equally common variety may be called, 

 by way of distinction, the bank lodge. They are of 

 two kinds. One is situated upon the bank of the 

 stream or pond, a few feet back from its edge, and en- 

 tered by an underground passage from the bed of the 

 stream, excavated through the natural earth up into 

 the chamber. The other is situated upon the edge of 

 the bank, a portion of it projecting over, and resting 

 upon the bed of the channel, so as to have the floor 

 of the chamber rest upon the bank or on solid ground, 

 while the external wall, on the pond side, projects 

 beyond it, and is built up from the bottom of the pond. 

 There is a lodge of this description near dam No. 14 

 represented in Plate IX. Originally it was a fine 

 lodge; but when I opened and measured it, in 1860, 

 it had been deserted for two or three years, and 

 had fallen into decay. A ground plan is given in 

 Figure 11. One-fourth part of it, which represents 

 the thickness of the external wall, projects beyond the 

 bank into the river, while the remainder, which in- 

 cluded the whole of the chamber, was upon the land. 

 It was constructed in the same manner, and presented 

 the same general appearance, as the one last described. 



Measurements. 



Height of lodge, on river side, from bed of channel. 6 ft. 6 inches. 



Height on land side 3 ft. 6 " 



Diameter on base line, on level of bank 12 ft. 



Transverse diameter 14 ft. 



Diameter of chamber 6 ft. 



Height of chamber from floor of lodge 2 ft. 6 inches. 



Height of floor above level of pond when full 3 " 



Size of entrances through floor 15 " square. 



Thickness of walls and roof 3 ft. to 3 ft. 6 inches. 



