CONTENTS. 



PAGE 



PREFACE ... ....... v 



INTRODUCTION 



On what fertility of soil depends ..... xi 

 Function of manures ....... xiii 



FARMYARD MANURE 



Variation in its composition ...... 1 



Made up of three classes of constituents 

 Solid excreta 



Its nature ........ 2 



Difference in composition of the solid excreta of the 

 different farm animals . . . . . 2 



Causes of this difference ...... 3 



Percentage of manurial ingredients in solid excreta 

 of different animals ...... 4 



Urine 



Its nature ........ 6 



Variation in its composition ..... 7 



Causes of this variation ...... 7 



Manurial value of the urine of the different farm 

 animals ........ 8 



Percentage of the organic matter, nitrogen, and min- 

 eral substances in the food, voided in the solid 

 excreta and urine 10 



