152 RAMBLES ABOUT HOME. 



grew in such a manner as to lessen the labor of building. 

 Thus we see that, while some birds are " smart," others 

 are less so, and that not a few have their weaknesses, just 

 as is so often the case in man. All of which, I think, is 

 a strong argument in favor of the theory that the mental 

 powers of birds are identical with those of man, differing 

 only in degree. 



