x CONTENTS 



SECTION III. METAL INDUSTRY 

 BY-PRODUCTS. 



Blast-furnace dust ......... 61 



Basic slag ............ 63 



Hardening residues 64 



References ............ 65 



SECTION IV. ALKALI INDUSTRY 

 BY-PRODUCTS. 



Leblanc soda ........... 66 



References ............ 70 



SECTION V. PLANT AND ANIMAL 

 REFUSE OF VALUE AS MANURE. 



Guano ............ 71 



Bones 72 



Wool wastes. Seaweed ......... 75 



References . . . . . . , . . . .76 



SECTION VI. ATMOSPHERIC NITROGEN. 



Liquid air ........... 77 



References . 82 



PART III. THE MANUFACTURE OF FERTILIZERS. 



SECTION I. INORGANIC NITROGEN 

 FERTILIZERS. 



Sulphate of ammonia . . . 83 



Nitrate of soda ....... ... 94 



Nitrate of lime ........... 97 



Ammonium nitrate 101 



References 103 



SECTION II. ORGANIC NITROGEN 

 FERTILIZERS. 



Calcium cyanamide . . . . . . . . .105 



Oilcakes 107 



Fish manure . . . . . .110 



Hoofs, horns and leather . . . 1 1 5 



References .... 117 



SECTION III. PHOSPHORUS FERTILIZERS. 



Phosphorus compounds in fertilizers . . . . . . .118 



Basic slag ... 120 



Superphosphates ........ .127 



