ALASKA FISHERY AND PUK-SEAL INDUSTRIES, 19 3 3 



309 



from year to year, the avera.i^e rate of increase for the breeding 

 orounds as a Avliole has been fairly constant over a period of years. 



ConiiMitatio)! of brccdinj/ coirs, hascd on annual inorcase of S itcrccnt, unxl of 

 average liarem, in 1933 



PUPS AND COWS 



The estimated number of cows and pups at the islands in 1933 

 was determined by applying an increase of 8 percent over the num- 

 ber computed for 1932. 



The number of dead pups was determined by applying the per- 

 centage found dead on each rookery in 1922. For comparative 

 purposes, the dead pups are included in the total number of pups. 



