CONTENTS xi 



Coloration — Colour Variation in Larvae — Colours of Reptiles, 

 especially Ijzards and Snakes — The Origin of Markings in 

 Snakes Page 225 



CHAPTER XII 



THE COLOURS OF BIRDS 



General Characters of the Coloration of Birds — Sexual Coloration — 

 Distribution of Colour and Colour Variation^ — Food and Colour — 

 Pigments of Birds, their Characters and Distribution — Pigments 

 of Birds' Eggs — Markings of Feathers . 242 



CHAPTER XIII 



THE COLOURS OF BIRDS {Continued) 



The Structure of Feathers — Relation between Structure and Colour 

 —The Colours of Sun-birds, Humming-birds, and Birds of 

 Paradise, their Distribution and Characters — Markings of King- 

 fishers — General Characters of the Colours of Birds — Meaning 

 of Colour in Birds ..... 262 



CHAPTER XIV 



THE COLOURS OF MAMMALS AND THE ORIGIN OF PIGMENTS 



Coloration of Mammals — Pigments of Mammals — Colour of the Hair 

 and Skin in Man, and its Bearing on General Problems — Origin 

 of Melanin — Pigment and Waste Products — Experimental 

 Evidence — Conclusions — Criticism of these Conclusions 286 



