212 



THE FUR SEALS OF THE PRII5ILOF ISLANDS. 



Daily counts of co/r-s-. 1 



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

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

 reached about July 15, 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 and making it difficult to distinguish those present from the rocks. 



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

 rookery without' too great loss of time, and so a section of 18 harems was singled out and the count continued on it. 



