114 U. S. BUREAU OF FISHERIES. 
make it after the St. Paul count, when one person was obliged to do 
both; and in 1920 it was thought best to continue the usual dates. 
However, if there is some one on the smaller island to whom the work 
can be delegated, it should be done. It was quite evident that harems 
had begun to break up, and some of the bulls which had completed 
their duties had resorted to the hauling grounds and elsewhere before 
the count was finished. Their places had been filled, of course, but 
it is better that the count be made just as the first harem masters are 
leaving. 
Before the count was made it was plainly to be seen that the class 
formerly called “surplus bulls” was not large enough to warrant 
much killing. It had been the practice in 1917, 1918, and 1919 to 
class those animals which were found in apparently permanent post- 
tion as “idle bulls” and others which evidently moved from place to 
place as “surplus bulls.” Naturally, these latter did not constitute 
the whole of the class, because there were always some on the hauling 
grounds and in the water in front of the rookeries. Since conditions 
in 1920 had closely approached those of 1916 in this respect, it seemed 
entirely proper to follow the former practice and spare the class in 
the killings. By doing this there is a “margin of safety” for the 
breeding males which is maintained without entering into the com- 
putations. 
HAREM AND IDLE BULLS AND PERCENTAGE OF IDLE BULLS TO HAREM BULLS Com- 
PARED TO AVERAGE HAREM, 1920. 
Idle bulls 
Rookery. Date. Bete Idlebulls.| Total. to harem pen 
E bulls. 5 
ST. PAUL ISLAND. Percent 
IGhitilce bonaasnoeRenonESace Seeacobse Sonabe July 18 132 57 1 P 28. 52 
liqbldrtabtals a5 aRe eae sageosadcnocdcconodaceone Sed Ose 95 28 123 29. 47 30. 86 
Gornbatche2 i 2222-2 eo eee cee eee eeatale July 19 253 40 293 15. 81 40. 52 
BAT GIFU OME cosas cece seiecise spice tetae ele see d0s=--- 40 8 48 20. 00 29. 50 
IEC Se aS Sho Gace: CEE EE aC aoh ose ne mensoee OO esc 528 70 598 13. 26 44.77 
Sihvqreln= 5a) eS Ae aR See Ses saonetcoduc Se GOs eae. 190 60 250 31. 58 44. 08 
ILEYE6(0) 1a RS es SOB aAaE eenBEmreob SSC CHOSE OES July 20 14 3 17 21. 43 24. 36 
ML OISLOLY. ssa cce cose oe eene sae eemoasee eae Bed Obese 408 65 473 15. 93 42.37 
PAP AAI See is se cs ales sactne ae ease - eee d0s2-<- 423 85 508 20. 09 38. 77 
SuThetungas - eet loos Soe ee ee eee eee ere Goh one |heeese eee 16 16 ||. 2. 32S 
Mitte Zapadui ccc cccisc cna cssiscpemncite soe loys 55 297 62 359 20. 88 42. 07 
Zepadnisheel. osc st eso se ce owire cece ae: dora 28 5 33 17. 86 19. 00 
(BOlOWIN ATE eae chee ccs seeee rece e eee July 18 177 75 252 42. 37 33. 93 
PolovinialClifis’ 5 .eomace jaciececssceseace ado:seee 86 24 110 27. 91 29. 92 
Mittle Bolovina 2-2. cess ccm 8 Nees 36:0055.-% 49 48 97 97. 96 34, 92 
IMOLOVEE 2th Sess oid Sete cince nes acid oes ete July 17 97 99 196 102. 06 30. 27 
WiOstoch nis. ees. Sense Secceateceoeeseecee Seed Osea 725 333 1,058 45. 93 45, 32 
Motalees Sache: lee oe eres Seen eo oee cee 3,542 1,078 4,620 30. 43 40. 45 
ST. GEORGE ISLAND. 
NORGE. 2ot cbc ss. coes ieisetwsoetnseneseee July 23 199 17 216 8. 54 45. 86 
ISLALAY AeAT ills soe eee eee eae eee a ents Coke laser 112 20 132 17. 86 53. 07 
ADACHI sh stete eet teat a dear oe Sette July 22 27 5 32 18. 52 33. 59 
NOUGE oe ochest ie oe sede sete cise sepe ane Ozses2 4s astemee Al ogocteeee 24. 75 
MaStwR Ceiaes. scoosten cn siecaetetaccemacsee G0 s-: 67 28 95 41.79 38. 37 
Mast Cutis ss ten cs ateceiem ce towel sees dostsc- 115 13 128 11. 30 48. 74 
Motalsas esa kc tee che eee seas beeen 524 83 607 15. 84 46. 28 
Totalsbothuislands 2c. s<.casee eens |e sere sse 4,066 1,161 5, 227 28. 55 41.20 
A comparison of the foregoing table with the corresponding one 
for 1919 shows that there has been a reduction of harem bulls of 
1,092 and of idle bulls of 1,078. There were even fewer animals in 
