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

APPENDIX TO CHAPTER XI.
NOTE
I. Analysis of bone-meal 371
II. Analysis of dissolved bones 371
III. Composition of bone-ash 372
IV. Composition of bone-char 372

CHAPTER XII.--MINERAL PHOSPHATES.

Coprolites 373
Canadian apatite or phosphorite 374
Estremadura or Spanish phosphates 375
Norwegian apatite 376
Charlestown or South Carolina phosphate 376
Belgian phosphate 377
Somme phosphate 378
Florida phosphate 378
Lahn phosphate 379
Bordeaux or French phosphate 379
Algerian phosphate 379
Crust guanos 379
Value of mineral phosphates as manures 380

APPENDIX TO CHAPTER XII.

Imports of phosphates 381

CHAPTER XIII.--SUPERPHOSPHATES.

Discovery of superphosphate by Liebig 382
Manufacture of superphosphate 383
Nature of the reaction takin