FUR-SEAL CENSUS, PKIBILOF ISLANDS, 1919. 



113 



to be sure, but more than had been expected. It was not thought that 

 the enormous excess of males which had been in reserve ow ing to the 

 closed season of 1912-1917 could be noticeably reduced in a single 

 season of commercial work; yet it was done and speaks well for the 

 conduct of the business by the island authorities. It should be noted 

 that not only the total number of bulls was slightly reduced but that 

 the percentage of idle bulls to harem bulls grew less. This is the 

 best evidence that the reasoning was sound which led to the con- 

 clusion in former years that a proportion of one idle bull to two 

 harem bulls produced the minimum average harem; and that this 

 latter is very close to 26, regardless of amount of male life, is a fore- 

 gone conclusion, 



AVERAGE HAREM. 



The counting of pups on certain of the rookeries enabled the 

 determination of the average harem on the rookeries counted. The 

 information derived therefrom, coupled with observation on the 

 ground, led to the results given in the table below. For purposes 

 of comparison the average harems in 1918 are given, showing graph- 

 ically the increase in size of harems. 



Average Harem in 1919 for all Rookeries. 



Rookery. 



Breeding 

 cows. 



Harem 

 bulls. 



Average 



harem, 



1919. 



Average 



harem, 



1918. 



ST. PAXIL ISLAND. 



Kitovi 



Lukanin 



Gorbatch 



Ardiguen 



Reef 



Sivntch 



Lagoon 



Tolstoi 



Zapadni 



Little Zapadni 



Zapadni Reef 



1 'olovina 



Polovina '"litis 



Little Polovina 



Morjovi 



Vostochni 



Total 



Total for rookeries counted 



ST. GEORGE ISLAND. 



North 



Staraya Artil 



Zapadni 



South 



East Reef 



EastCMs 



Total ...., 



Total for rookeries counted 



Total, both islands 



3,565 



2,7S8 



12,308 



1,150 



22, 457 



7,015 



445 



16, 027 



14,300 



10,145 



604 



5,794 



2,209 



1,203 



3,041 



30, S63 



8,802 

 5,746 

 857 

 68 

 2,367 

 5.418 



23,258 



155 

 110 

 362 



46 

 720 

 230 



17 

 538 

 546 

 344 



28 

 192 



96 



38 



147 



1,004 



O23.00 

 a 25. 34 

 34.00 

 25.00 

 31.19 

 a 30. 50 

 b 26. 18 

 a 29. 79 

 o 26. 19 

 29.49 

 621.57 

 6 30.18 

 b 23. 01 

 31.66 

 b 20. 69 

 o 30. 74 



225 

 124 



27 

 5 



75 

 129 



o 39. 12 

 b 46. 34 

 6 31.74 

 6 13.60 

 6 31.56 

 a 42. 00 



39.76 

 39.42 



5,158 



30.47 



20.00 

 o 22. 35 

 31.00 

 a 22. 00 

 6 28. 19 

 27.50 

 6 20.48 

 o 26. 76 

 o23. 19 

 o 26. 49 

 6 19. 85 

 628.88 

 20.23 

 o 28. 67 

 o23 00 

 «27.74 



26. 59 



27.88 



o 26. 75 



o34.no 

 b 18. 74 

 6 7.62 

 6 21.41 

 o 30. 00 



27.65 



19.91 



26.74 



« Estimate. 



6 Pups counted. 



The most significant information bearing upon the average harem 

 is furnished by Polovina Rookery. In 1918 it had 185 harems and 



