x CONTENTS. 



CHAPTER IV. 



PAGE 



INDICATIONS OF FERTILITY (continued) THE SUBSOIL GEO- 

 LOGICAL POSITION OF SOILS AFFECTING FERTILITY GEO- 

 LOGICAL KNOWLEDGE TO BE USED WITH CAUTION GEOLOGI- 

 CALLY RECENT SOILS 49 



CHAPTER Y. 



SOILS OF THE LONDON CLAY SOILS OF THE CHALK FORMATION 65 



CHAPTER YI. 



GEOLOGICAL SECTION FROM HERTFORD TO BRIDGWATER SOILS 

 OF THE GREEN SAND FORMATIONS THE GAULT CLAY THE 



WEALD THE UPPER OOLITE THE MIDDLE OOLITE THE 



LOWER OOLITE THE LIAS THE NEW RED SANDSTONE 



THE PERMIAN FORMATION THE COAL MEASURES THE 

 MOUNTAIN LIMESTONE THE MILLSTONE GRIT AND YORE- 

 DALE ROCKS THE OLD RED SANDSTONE 71 



CHAPTER VII. 



FORMATIONS YIELDING SOILS OF CLAYEY, FREE, POOR, AND RICH 

 CHARACTER REVIEW OF INDICATIONS OF FERTILITY 

 DIFFERENCES BETWEEN QUALITY AND VALUE OF LAND 

 SEDENTARY AND TRANSPORTED SOILS PEAT SOILS VOL- 

 CANIC SOILS METHODS OF IMPROVING SOILS LAND 

 DRAINAGE REASONS FOR ITS USEFULNESS ... ... 87 



CHAPTER VIII. 



BENEFICIAL EFFECTS OF VEGETATION ON SOILS AFTER DRAINAGE 

 ACTION OF DRAINS IN LIGHT SOILS ACTION OF DRAINS 



ON RETENTIVE SOILS SMITH'S SYSTEM ELKINGTON's 



SYSTEM ADVANTAGES OF DRAINAGE IMPROVEMENT OF 

 LAND BY TRENCH PLOUGHING SUBSOILING CLAY-BURNING 

 CLAYING MARLING CHALKING WARPING ORDINARY 

 CULTIVATION 97 



