IV CONTENTS. 



CHAPTER V. PAGE 



THE ELEMENTS OF SOILS. 

 XIIL The Elements. XIV. Soil Analysis 61-71 



CHAPTER VI. 

 IMPROVEMENT OF SOILS. 



XV. Taming the Land. XVI. Tillage. XVII. An Ancient 



Tool. XVIII. Experiments in Tillage 72-95 



CHAPTER VII. 



M ANUS A HAND. 



XIX. An Old Fable. XX. Fertilizers. XXI. Plants as Fer- 

 tilizers. XXIL What to do 96-116 



CHAPTER VIII. 



ARTIFICIAL SOILS. 

 XXIIL Potting Soils. XXIV. Making New Soils . . . 117-127 



