viii 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 Ccelentera — The Effect of Light upon the 

 Development of Pigment — The Pigments of the Ccelentera — 

 Optical Colours . . . . -73 



CHAPTER V 



COLOUR -PHENOMENA IN WORMS 



Colours of Turbellaria and Nemertea — Pigments of Gephyrea — Colours 

 of the Chstopoda, Structural and Pigmental Colours — The 

 Pigments of the Capitellidae — General Characters of Colora- 

 tion of Leeches and Origin of Markings — Pigments of Polyzoa 

 and the Origin of Pigmentation ... 96 



