TABLE OF CONTENTS. 



CHAPTER I. 

 INTRODUCTORY. 



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. Haemoglobin. Chlorophyll. 

 Other Pigments of Physiological Importance. The Coloration of 

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

 Constancy of 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 Pigments and Excretory Products. ...... 



CHAPTER II. 

 COLORATION AFFECTED BY THE ENVIRONMENT. 



Local Colour Varieties. Geographical Distribution of Colour. Additional 

 Instances of an Apparent Connection between Colour and Locality. - 

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

 Examples of Melanic Varieties found upon Islands. Further Examples 

 of Effects of Temperature and Moisture. Influence of Light. Absence 

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

 uf Light. Colour sometimes Dependent upon Light. Bright Colours in 

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

 Absence of Cohan 1 in Cave Animals. Seasonal Change in Colour. 

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

 of Colour in Arctic Animals. Seasonal Dimorphism . 



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