XXVI CONTENTS. 



CHAPTER XVI. MINOR ARTIFICIAL MANURES. 



Scutch 427 



Shoddy and wool-waste ........ 427 



Soot 428 



CHAPTER XVII. SEWAGE AS A MANURE. 



Irrigation .......... 431 



Effects of continued application of sewage .... 433 



Intermittent irrigation . . . . . . . .434 



Crops suited for sewage . . . . . . . .434 



Treatment of sewage by precipitation, &c. .... 436 



Value of sewage sludge ........ 439 



CHAPTER XVIII. LIQUID MANURE .... 442 



CHAPTER XIX. COMPOSTS. 



Farmyard manure a typical compost . . . . .446 

 Other composts ......... 447 



CHAPTER XX. INDIRECT MANURES. 



Lime 449 



Antiquity of lime as a manure . . . . . .449 



Action of lime ......... 449 



Lime a necessary plant-food ...... 450 



Lime of abundant occurrence ...... 452 



Lime returned to the soil in ordinary agricultural practice 452 



Different forms of lime 453 



Caustic lime ......... 453 



Lime acts both mechanically and chemically . . .455 

 I. Mechanical functions of lime ...... 455 



Action on soil's texture ....... 455 



Lime renders light soils more cohesive . . . .457 



II. Chemical action of lime ....... 457 



