Beaver World Frontispiece 



A Young Beaver on the side of a Beaver House 6 



A Young Beaver Sunning Himself . . .22 

 In the Harvest-Field . . . . . 32 



Aspens cut by Beaver. 



Beaver Ponds 42 



A New Dam 66 



Part of an Old Dam 1040 Feet Long . .78 



The Spruce Tree House and Food-Pile, October 12 92 

 Lake-Bed Canals at Lily Lake, October, igil . 102 

 Section of a J^O-foot Canal at Lily Lake . . 102 

 Plan of Beaver Colony on Jefferson River, near 



Three Forks, Montana 108 



An Unplastered and a Plastered H oust . .124 

 The 334-foot Canal . . . . . .140 



Plan of Moraine Colony, with Dead- Wood Dam 144 



The Dead-Wood Dam . . . . . .148 



xiii 



