-1883.] Psychology. 1197 
mens for the State Cabinet, the desire inculcated in his first les- 
sons in natural history became imperative, demanding verification. 
Here was an opportunity to reach the inner life of an animal 
whose works had been repeatedly described as exhibiting human 
intelligence, but whose method and manner of accomplishment 
no one had seen. 
With two assistants the dam of an undisturbed family was 
broken down to the bottom, displacing a large log which formed 
its base. Then with jeers at his “ dam foolishness” his compan- 
ions returned to camp; while he, secreted in the bushes close by, 
awaited the result. 
e says: “ At early twilight five beavers came out from holes 
in the bank and looked the devastation all over. ‘ Their capacity 
hole’ 
the digger would come to the surface to breathe, a 
TERTERA the whole gap was filled. The process of covering 
oodwork with earth, leaves, bog or whatever came to j 
