XXIV CONTENTS. 



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 



Somnie 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 taking place ...... 385 



Phosphates of lime ......... 385 



Reverted phosphate . . . . . . . .389 



Value of reverted phosphate . . . . . . .391 



Composition of superphosphates ...... 391 



Action of superphosphates . . . . . . .392 



Action of superphosphate sometimes unfavourable . . . 395 

 Application of superphosphate . . . . . . .395 



Value of insoluble phosphates ....... 396 



Rate at which superphosphate is applied 397 



