turned first one side up and then the other. This, I think, 
happened every time he swooped, hut I could not make sure 
that such was the case. What I did see beyond the possi¬ 
bility of mistake was that he tilted them two or three times 
during each of the two flights when I had him in view. If 
I am not greatly mistaken, no one has ever noticed this 
tilting before or at least reported doing so. I, certainly, 
saw it to-night for the first time. It was very marked and 
interesting. I think the bird happened to be at just the 
right angle with my line of vision. During his first flight 
he made rather short and regular swoops; during the second, 
his movements were so swift and erratic that my eyes 
were taxed to follow him. His song was hardly up to the 
standard for his voice lacked strength and fulness, 
although it was as sweet as usual. 
