Vlll 
COLOUR IN NATURE 
CHAPTER III 
THE COLOURS AND PIGMENTS OF PLANTS 
Pigments and Colours of Bacteria and Fungi—Chlorophyll and the 
Associated Pigments—Colour and Pigments of Algae—Pigments 
of Flowering Plants—Autumnal Coloration—Colours of Flowers 
and Fruits—Meaning of Plant Pigments and Summary Page 51 
CHAPTER IV 
THE COLOURS OF PROTOZOA, SPONGES, AND CCELENTERA 
Pigments of the Protozoa, their Characters, Variations, and probable 
Origin—Coloration of Sponges and Coelentera—Distribution of 
Colours — The Colours of Corals and Sea-Anemones—-Colour 
Resemblances in the Coelentera—The Effect of Light upon the 
Development of Pigment — The Pigments of the Coelentera— 
Optical Colours . . . . -73 
CHAPTER V 
COLOUR-PHENOMENA IN WORMS 
Colours of Turbellaria and Nemertea—Pigments of Gephyrea—Colours 
of the Chsetopoda, Structural and Pigmental Colours — The 
Pigments of the Capitellidse—General Characters of Colora¬ 
tion of Leeches and Origin of Markings—Pigments of Polyzoa 
and the Origin of Pigmentation ... 96 
