CONTENTS 



CHAPTER PAGE 



I. Flowers and Humanity 1 



II. The Discovery of the Secret of Flowers ... 8 



HI. Flowers Pollinated by the Wind 20 



IV. Bees as Builders of Flowers 47 



V. Bumblebee-Flowers 70 



VI. The Gathering of the Nectar 89 



VII. Bees Which Visit Only One Kind of Flower . 105 



VIII. Butterfly-Flowers 125 



IX. Nocturnal or Hawk-Moth Flowers 139 



X. Fly-Flowers 100 



XL Beetles and Flowers 178 



XII. Pollen-Flowers 193 



XIII. Is CONSPICUOUSNESS AN ADVANTAGE TO FlOWERS .^ . 203 



XIV. The Colors of North American Flowers . . . 221 



XV. Bees and F'ruit-Growing 261 



Index 279 



