CONTENTS 



Introduction page o 



Material o 



Sex ratio lo 



External characters lo 



Body proportions ....'. lo 



Colour 24 



Hair -^y 



Ventral grooves 38 



Baleen ^o 



Possible differences between northern and southern races 42 



Food IT 



Blubber ^3 



Parasites ^.y 



External ^-j 



Internal in 



Reproduction 50 



The male : 



External genitalia 50 



Testes r© 



The sexual cycle ci 



The female : 



External genitalia 51 



Internal genitalia 52 



Ovaries 52 



Uterus 53 



Mammary glands ca 



Gestation and breeding season cc 



Sexual cycle 60 



Growth 67 



Migration nn 



Destruction of the stocks of Humpbacks 82 



Summary 85 



References 88 



Appendix. Measurements 89 



Plate II following page 92 



