A NEST IN A WATERFALL. 



213 



posite directions and send themselves forward in the 

 way they wish to go, their greater weiglit enabling 

 them to make better headway through the opposing 

 air. 



" The dipper does just the same. If it wishes to go 

 downward, it strikes upward with its wings ; to come 



The American dipper. 



up, it does the reverse. The only difference is that the 

 wings are held recurved, as running birds use them, 

 and gravitation has even less to do with the matter 

 than in flying." 



The nest of the dipper is placed as near the water 

 as possible. Dr. Cooper found one built under the 

 roots of an enormous tree that had floated over and 

 rested in a slanting position against the dam of a saw- 



