CONTENTS. 



CHAPTER I. 



The Dead-nettle Cross-fertilisation The writings of Sprengel, 

 Darwin, Hooker, Bennett, Delpino, Hildebrand, Kerner, Miiller, 

 &c. Relations of Plants and Insects Insectivorous Plants 

 Drosera, Pinguicula, Utricularia, Sarracenia Fertilisation of 

 Flowers by Insects Structure of a Flower Geranium Economy 

 of Pollen Prevention of Self-fertilisation Vallisneria Wind- 

 fertilised Plants Industry of Bees and Wasps Bees and Colours 

 Use of Scent to Flowers Structure of Flowers Malva 

 Geranium Scrophularia Aristolochia Arum Use of Honey 

 Explanation of Dead-nettle Salvia Pages i 22 



CHAPTER II. 



The Antirrhinum Heath Chervil Daisy Chrysanthemum Lotus 

 Furze Broom Cleistogamous Flowers Dimorphous Flowers 

 Primrose and Cowslip The Use of Honey Attraction of 

 Insects by Honey Protection of Plants by Insects Protection of 

 Plants against Insects Chevaux de Prises Glandular Hairs 

 Slippery Surfaces Barriers Sleep of Plants Sleep of Leaves 

 Relation of the Sleep of Flowers to the Habits of Insects 

 The Scent of Flowers Bee Flowers and Fly Flowers The 

 Origin of Flowers Pages 23 44 



