Vi CONTENTS CONTINUED. 



Page. 



Seventeenth Chapter — Our Sources of Phosphoric Acid, 103 



Eighteenth Chapter— Our Sources of Potash, - - 113 



Nineteenth Chapter — Muck and Its Possibilities, - 118 



Twentieth Chapter — Flesh and Fish Composts, - - 122 



Twenty-First Chapter— Table of Analytes and Valuations, 125 



PART III. — Principles of Economic Application. 



Twenty-Second Chapter— The Needs of Soil and Crop, 129 



Twenty-Third Chapter — Clover and other Plants as Man- 

 ure Crops, ..-.-. 135 



Twenty-Fourth Chapter — Plant Foods Needed in Ordin- 

 ary Crop Rotation, - - - - - 141 



Twenty-Fifth Chapter — Feeding our Fruit and Veget- 

 able Crops, ...... 145 



Twenty-Sixth Chapter— Manures for Farm and Market 



Gardens, _..._. 150 



Twenty- Seventh Chapter — Fertilizers for Mucky Soils, 155 

 Twenty-Eighth Chapter— Tests of Soil Fertility, - 158 



Twenty-Ninth Chapter— Some Leading Principles. - 161 



