CONTENTS. XX111 



Is nitrate of soda an exhausting manure ? 345 



Crops for which nitrate of soda is suited . . . . .346 



Method of application of nitrate of soda ..... 347 



Importance of having a sufficiency of other fertilising con- 

 stituents .......... 348 



Conclusions drawn ......... 349 



APPENDIX TO CHAPTER IX. 



Total shipments from South America, 1830-1893 . . .351 

 Total imports into Europe and United Kingdom, 1873-1892 . 351 



CHAPTER X. SULPHATE OF AMMONIA. 



Value of ammonia as a manure ...... 352 



Sources of sulphate of ammonia ...... 353 



Ammonia from gas-works ....... 353 



Other sources .......... 354 



Composition, &c., of sulphate of ammonia .... 355 



Application of sulphate of ammonia . . . . .356 



APPENDIX TO CHAPTER X. 



Production of sulphate of ammonia in United Kingdom, 



1870-1892 358 



CHAPTER XI. BONES. 



Early use of bones ......... 359 



Different forms in which bones are used ..... 360 



Composition of bones ........ 362 



The organic matter of bones . . . . . . .363 



The inorganic matter of bones ....... 363 



Treatment of bones ......... 364 



Action of bones ......... 365 



Dissolved bones ......... 368 



Crops suited for bones ........ 368 



Bone-ash 369 



Bone-char or bone-black ........ 369 



