CONTENTS. 



PART IL 



SEXUAL SELECTION— contimwd. 



CHAPTER XII. 



SECONDARY SEX0AL CHARACTERS OF FISHES, AMminiAXS, AND REPTILES. 



Fishes : Courtship and Rattles of the Males. — Larf^or Size of tlie Females.^ 

 Males, Briglit Colors and Ornamental Appendaf^es ; other Stran;,'e 

 Cliaracters. — Colors and Appenda;;es acquired by the Males during tlie 

 Breeding-season alone. — Fishes with both Sexes brilliantly colored. — 

 Protective Colors. — Tiie less Conspicuous Colors of the Female cannot 

 be accounted for on the Principle of Protection. — Male Fishes building 

 Nests, and taking Charge of the Ova and Young. Amphibians : Dift'er- 

 ences in Structure and Color between the Se.xes. — Vocal Oigans. Rep- 

 tiles : Chelonians. — Crocodiles. — Snakes, Colors in some Cases pro- 

 tective. — Lizards, Battles of. — Ornamental Appendages. — Strange Dif- 

 ferences ill Structure between the Se-xes. — Colors. — Se.\ual Differences 

 almost as great as with Birds . . . . . p. 1 



CHAPTER XIII. 



SECONDARY SEXUAL CHARACTERS OF BIRDS. 



Sexual Differences. — Law of Battle. — Special Weapons. — Vocal Organs. — 

 Instrumental Music. — Love-Antics and Dances.— Decorations, Perma- 

 nent an<l Seasonal. — Double and Single Annual Moults. — Display of 

 Ornaments by the Males ...... 86 



CHAPTER XIV. 



BIRDS — contiunrd. 



Choice exerted by the Female. — Length of Courtship. — Unpaired Birds. — 

 Mental Qualities and Taste for the Beautiful. — Preference or Antip- 

 athy shown liy tiir Female for Particular Males. — Variability of 



