Vlll 



TABLE OF CONTENTS 



CHAPTER III 



llli: MKXDKI.IAX PRINCIPLES OF HEREDITY 

 \M» THEIK BEARING ON SEX 



]. Ml \l>l L*8 I >l-< <>\ KIIIKS 



2. 'I'm Heredity of One Pair of Characters. 



;. Tin Hi i;i cditj of a Sex-linked Character . 



I. Tin Heredity of Two Pairs of Characters 



"». The Heredity of Two Sex-linked Characters 



6. A Tin or - * of Linkage 



7. Three Sex-linked Factors .... 



PAGES 



73-75 



75-80 

 80-84 

 84-88 

 88-93 

 93-97 

 98-100 



CHAPTER IV 



SECONDARY SEXUAL CHARACTERS AND THEIR 

 RELATION TO DARWIN'S THEORY OF SEX- 

 UAL SELECTION 



L. Iiik Occurrence of Secondary Sexual Charac- 



rERS in the Animal Kingdom .... 



2. Courtship 



•"•• Vl i and Secondary Sexual Characters . 



I. Continuous Variation as a Basis for Selection 

 5. l»i-« ontindoi - Variation or Mutation as a Basis 



I OR Si II i HON 



101-112 

 112-120 

 120-121 

 121-125 



125-131 



CHAPTER V 



THE EFFECTS OF CASTRATION AND OF TRANS- 

 PLANTATION ON THE SECONDARY SEXUAL 

 CH LRACTERS 



Operations on Mammals .... 132-141 



142-144 



•_'. < >ii i: \ i iuns on Birds . 



I >!•! R \ I KiN- .,n \\lnill'.| \ 



•■ In iv RN U Si < i:i i [ONS . 

 1 'it i: v i [onb ON [nS] 



' Parabitn Castration of Crustacea 



145-146 

 146-147 

 148-155 

 155-158 



