CONTENTS. 



CHAPTER L 



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 IL 



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 Frises — 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 



