212 



THE FUR SEALS OF THE PRII5ILOF ISLANDS. 



Daily counts of roirx. ] 



Note: These counts show dearly tin- gradual development of rookery population during the, 

 breeding season. The cows begin to arrive about the 12th of .lime. The maximum of population is 

 reached about July 1~>, from which time on there is a gradual decrease of population due to the 

 lengthening absence of the cows on their food excursions. 



1 Weather clear; no storms or surf, except one day when rain fell, causing a larger number of cows to take to the 

 water nn<l making it difficult to distinguish tho.se present from the iock^. 

 ' 



rookery 



'Rain. 



'After July 14 it became impossible, on account of the scattering of the cows, to continue tin- count for the entire 



ry without too great loss of time, and so :l section of 18 harems w;i* singled mil ;md the count continued on it. 



