Notes and Comments. 



233 



Dam, which I took recently in Southern Alberta. As you 

 know, the activities of these animals are such that in the 



course of time they actually alter the drainage system of the 

 area in which they work. As the Beaver was an inhabitant 



of East Yorkshire many years ago, and probably carried on 

 the same kind of engineering work there, these pictures should 

 interest your readers.' 



1921 July 1 



