TABLE OF CONTENTS. 



CHAPTEE I. 



I.YTBODUCTORy. 



The Colours of Animals. — Colours caused by Absorption of Light due to the 

 Presence of Pigments.— Colours associated with Substances of Physio- 

 logical Importance to the Animal. — Hemoglobin. — Chlorophyll. — 

 Other Pigments of Physiological Importance. — The Coloration of 

 Animals. — Plan of Coloration not always Useful to the Animal. — 

 Constancy oE Coloration. — The Action of Natural Selection in pro- 

 ducing Colour Changes must be strictly Limited. — Comparative Con- 

 stancy of Colour in Genera and Species. — The same Plan of Coloration 

 often found in Distantly-related Animals. — Relation between Colora- 

 tion and Structure. — Changes of Colour during Lifetime. — Absence 

 of Brilliant Coloration among Mammals. — The Colours of Deep-sea 

 Animals. — Change of Colour after Death. — ^Connection between In- 

 tegumental Pi,i,'ments and lixcretory Products. ... 1 



CHAPTER II. 



COLORATION AFPMCTED BY THE EXVIRONMENT. 



Local Colour Varieties. — Geographical Distribution of Colour. — Additional 

 lustanccs of an Apparent Connection between Colour and Locality. — 

 EfEeets of Food upon Colour. — Effects of Temperature and Moisture. — 

 Examples of Mclanic Varieties found upon Islands. — Further Examples 

 of Effects of Temperature and Moisture. — Influence of liight. — Absence 

 of Colour in Animals which live in Darkness not always due to Absence 

 of Light. — Colour sometimes Dependent upon Light. — Bright Colours in 

 Subterranean Animals. — Influence of Light upon Colours of Flat-fish. — 

 Absence of Colour in Cave Animals. — Seasonal Change in Colour. — 

 Seasonal Change in Orthoptera. — Seasonal Change in a Beetle. — Change 

 of Colour in Arctic Animals. — Seasonal Dimorphism . . . .42 



