CENSUS OF ROOKERIES IN 1896. 93 
“CORRECTION FOR ABSENT COWS. 
_ Averaging the various. counts it seemed . that the proportion of live pups to. the 
apparent ‘number of cows present in the breeding season was 1.75. Our experience 
during the season of 1897 shows that this was ‘too low, and that it would have been 
better had the simple conditions of Kitovi rookery been taken as typical of the other 
rookeries, using its proportion of 191 tol, : 
On the basis of our count of live pups the previous census was corrected by the 
addition of 75 per cent to allow for absent cows in the height of the season. Tn this 
way the completed preliminary : census put forward in 1896 was made. It is as follows: 
Summary of breeding seals ( counts and estimates) 1896. 
Rookery. Harenis.|',Cows | Actual 
(count). total. 
ST. PAUL. : 
Kitovi.. 182 8, 152 6, 049 
| Lukanin 147 2,543 4,450 
Lagoon . 120 1,474 2, 484 
Tolstoi (main). ai 389 6,-729 11,775 
g aolsiol | CGLUFES). sesje: cis retirs oe ata arenes setdateraicinomine reece - 108 1,498 2, 664 
Little Zapadni 210 2, 400 4, 200 
Zapadni Reef 176 2, 256° 3, 862 
eH | Gorbatch - 302 5, 224 9, 142 
; Ardiguen . 27 550, 652 N 
Reef .....-.- - 504 8, 719 15, 258 
Sivutch Rock...............--.------ see-ee eens 63 1, 090 1,907 | 
Polovina (main). ween ticle He sie wieleides wiarwinleima eigimlamnsc j 138 2, 387 4,177 
| Polovina ‘cliffs).... é 86 1, 268 2, 496 
Polovina. (little)... 45 779 1, 363 
Vostochni 975 15, 879 27, 148 
293 4,328 7,773 | 
44 761 1, 350 
135 2, 335 4, 086 
182 3, 148 5, 509 
661 11, 432 20, 023 
Grand total - egictin Seirelgne WJesiaas sctceceasSuce 5, 009 81, 793 143, 071 
Bobrovi (Otter Island) had 1 harem, containing 5 cows and 5 pups. 
REVISION OF CENSUS OF 1896. 
Asalready intimated, the estimate for St. George Island for 1896 is not satisfactory. 
That Little East rookery was considerably underestimated is evident from a closer 
gnspection of this breeding ground during the season of 1897. The original count 
gave only 27 harems, but. probably included no more than two-thirds of the rookery. 
As there were bit few idle bulls about this rookery, the count of bulls made late in 
July can not be far out of the way here, and in the absence of a better estimate it 
may be allowed to stand. F 
CORRECTIONS ON 87. GEORGE. 
On Zapadni and North rookeries, however, the number of harems counted in the 
latter part of July can not be accurate. When the rigid harem system breaks up and 
the original harem masters begin to leave, the idle bulls (of which there were many 
about these rookeries) enter the breeding grounds, increasing the number of families, 
