CONTENTS 
INTRODUCTION 
Colour in Nature and in Organisms—Characters of the Colours of 
Organisms and their General Importance—Method of Treatment 
Adopted ...... Page i 
CHAPTER I 
THE COLOURS OF ORGANISMS 
Colour Phenomena in General—Distinctions between Pigmental and 
Structural Colours — Characters of Structural Colours and their 
Classification — Production of Light by Organisms (Phosphor¬ 
escence) ...... 6 
CHAPTER II 
THE PIGMENTS OF ORGANISMS 
Natural and Artificial Pigments — Classification of Pigments — Pig¬ 
ments of Direct Physiological Importance—Derived Pigments 
—Waste Products — Reserve Products—Introduced Pigments 
—Distribution of Pigmental Colours—Spectroscopic Characters 
of Pigments ...... 25 
