CONTENTS 



Introduction P a S e 22 5 



Modern pelagic whaling 22 5 



Scope of investigations 22 ° 



Biological notes 2 3° 



External parasites .... 230 



Length at sexual maturity .... 2 3° 



Incidence of pregnancy 2 3 2 



Foetal sex ratio 2 3 2 



Foetal growth curve 2 33 



Ovaries: corpora lutea 2 33 



Physical maturity 2 3° 



Summary 2 3° 



The rate of breeding 2 39 



South Georgia data 2 39 



Pelagic data 2 4 r 



Age determination 2 43 



Doubtful corpora lutea 2 44 



Length and corpora lutea - • 2 44 



Recent ovulations 2 4° 



Corpora lutea frequencies for two seasons 25 1 



Similarity of frequencies 2 5° 



Homogeneity of adult catch 2 5" 



Age and corpora lutea (Summary) 259 



The age at physical maturity 259 



Present span of life 260 



Population and recruitment 261 



Average length of blue females 265 



Increase of immature whales in the catch 266 



Summary 267 



Literature cited 269 



Appendix I: Blue whales taken in the Antarctic since 1904-5 and off the 



coast of Africa since 1910 270 



Appendix II: Particulars of the collections of ovaries, 1934-6 271 



