xii CONTENTS. 



CHAPTER XIII. 



PAGE 



ROTATIONS OP CROPS PRIMITIVE ROTATIONS DEVELOPMENT OF 



ROTATIONS PRINCIPLES OF ROTATIONS THE FALLOW 



GRAIN AND FODDER CROPS EFFECT OF CLOVER ON SUB- 

 SEQUENT WHEAT CROPS SIMILAR EFFECT OF BEANS 

 MODIFICATIONS OF THE NORFOLK FOUR COURSE CATCH 

 CROPS POTATOES AS A CROP ... ... ... ... 181 



CHAPTER XIV. 



DEPRECIATED VALUE OF CLAY LANDS HOW TO MAINTAIN LIVE 

 STOCK ON CLAY SOILS CATCH CROPPING A MATTER OF 

 SITUATION SOIL AND CLIMATE THE THEORY OF ROTA- 

 TIONS CLOVER SICKNESS PRACTICAL ADVANTAGES OF 



ROTATIONS PURIFYING EFFECT ON LAND FOR SHEEP 



ADVANTAGES OF LIGHT SOIL LAYING LAND DOWN TO 



GRASS ITS DIFFICULTIES ITS EXPENSE ITS TEDIOUSNESS 



HOW BEST TO BRIDGE OVER THESE DIFFICULTIES ... 200 



CHAPTER XV. 



PROPER STANDARD FOR VALUING TILLAGE OPERATIONS THE COST 

 OF MAINTAINING A FARM HORSE THE COST OF TILLAGES 

 THE COST OF GROWING A CROP OF WHEAT AFTER CLOVER 

 SMALL MARGIN OF PROFIT FROM WHEAT GROWING . 216 



