CONTENTS 



CHAPTER 



PAGE 



I. Introductory j 



II. Pioneer Laborers j. 



III, Soil-Makers - - . . . -,. 



IV. Soil-Carriers «^ 



V. Soil-Binders ---... 40 



VI. Field-Laborers - 47 



VII. F iEL.Tf-LABORERS— continzied ... 55 



VIII. Water - 66 



IX. Deserts 81 



X. Roots iqq 



XI. Food from the Soil 114 



XII. Leaves and Their Work - - . . 130 



XIII. Climate - 149 



XIV. Blossom and Seed - . . . . 161 

 XV. The Golden Rule for Flowers - - - 178 



XVI. Guests Welcome and Unwelcome - 196 



XVII. Seed-Scattering - - - - - - 214 



XVIII. Seed-Carriers .-...- 225 



XIX. Chances of Life 237 



XX. Friends and Foes . . . . . 256 



XXI. Nature's Militia 267 



