Miscellaneous Papers. 



375 



nity. I had only a common rectilinear lens to work with, and I 

 knew that snap-shots here were out of the question, owing to the 

 shadows of the trees and the dark background beyond the nest. I 

 was forced to use short time exposures — a hazardous business 

 when your subjects are birds busy at a feast. Of some two dozen 

 exposures made in the course of the three days during which I per- 

 sisted in my efforts, only two proved successful. Convinced of 

 the itiefficiency of my lens I made no further attempt to secure 

 photographs of the old birds. A lens with a working speed of y6 

 would have enabled me to do what I found impossible to do with 

 my common rectilinear lens. I contented myself with securing 

 a final photogjaph of the young hawks just the evening before 

 they abandoned the nest. 



Young hawks ready to leave their nest. 



