IS- 



lilUI) STUDIES WITH A CAMKUA 



until the bird is two years old, tlie question arises. 

 What hecomes of the immature birds during the 

 nestina- season ? 



An estimate of the number of individuals repre- 

 senting the seven species just mentioned as nesting 

 on the Rock, is perhajis not warranted by my brief 

 experience, nor should I attempt to give one, did not 

 my jjlKjtographs iiermit me to count with a fair de- 

 gree of accuracy the numljer of birds in view on that 

 part of the Ro(;k shown in thi'se pictures. Time 

 was laclving to make, from a boat, a series of ])hoto- 

 graphs of tlie Ruck which wouhl include all its 

 liird-iidialjited ]iorti(ins, and the a]>i)ended estimates 

 are based on the results of a count of the birds in 

 photographs of about one lialf tlie occupied area. 

 Murres, Razoi'lulls, and Pullins can not be distin- 



