the lodge, the burrow, the tree-cutting, and the 

 artificial canal, each testifying to his handiwork, 

 and affording us an opportunity to see the appli- 

 cation as well as the results of his mental and 

 physical powers. There is no animal below man 

 in the entire range of Mammalia which offers to 

 our investigation such a series of works, or pre- 

 sents such remarkable material for study and 

 illustration of animal psychology." 



Mr. Morgan was for years a capable and pains- 

 taking student of the beaver. That which he has 

 written is so important a contribution concerning 

 the beaver that no one interested in this animal 

 can afford to be unacquainted with it. In the pre- 

 face of his book he says : " I took up the subject 

 as I did fishing, for summer recreation. In the 

 year 1861, I had occasion to visit the Red River 

 Settlement in the Hudson's Bay Territory, and 

 in 1862, to ascend the Missouri River to the 

 Rocky Mountains, which enabled me to com- 

 pare the works of the beaver in these localities 

 with those on Lake Superior. At the outset I 

 had no expectation of following up the subject 

 year after year, but was led on, by the interest 



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