CONTENTS. xi 



CHAPTER XIII, 



PAGES 



MANUFACTURE OF MANURE FROISI ANIMAL WASTE. 



Preliminary remarks— Blood — Dried blood — Donard and Boulet's drying 

 machine — Meat meal — Drying blood by lime — Commercial meat 

 meal — Horn — Leather waste — Comparative value of different nitro- 

 genous manures 255-267 



CHAPTER XIV. 



RECOVERY OF NITROGEN FROM DISTILLERY SPENT WASH. 

 MANUFACTURE OF CYANAMIDE AND OF NITRATE OF LIME. 



Utilization of distillery spent wash — General remarks — Recovery of 

 nitrogen b}' Vasseux's process — Treatment of the spent wash by 

 biological agents — Effront's methods — Treating spent wash by 

 fermentation — The manufacture of cj'anamide and of nitrate of 

 lime — Agricultural experiments with cyanamide — Rules for the use 

 of cyanamide — Drawbacks in the use of nitrate of lime - - 268-277 



CHAPTER XY. 

 NITROGENIZED PHOSPHATIC MANURES. 



Peruvian guano — Its composition — Dissolved Peruvian guano — Other 

 nitrogenized guanos — Bat guano — Hungarian bat guano — Eboli bat 

 guano — Egyptian bat guano — Fish guano: historical review — The 

 early manufacture of fish guano in Newfoundland and in Great 

 Britain — Manufacture of fish guano in Norway — The fish guano 

 industry in Britain - . . - 278-294 



CHAPTER XVI. 

 POTASSIC MANURES. 



:Stassfurt salts— Crude potash salts — 1. Carnallite — 2. Sylvine or sylvinite 

 — 3. Kainit — 4. Schoenite — 5. Polyhalite — 6. Krugite — Dissolving 

 the crude salts — Clarification — Crystallization — Clarifying — Treat- 

 ment, of the mother liquor from the potassium chloride — Drying tlie 

 chloride of potassium — Potassium sulphate — Double carbonate of 

 potassium and magnesium — Double sulphate of potassium and 

 magnesium — Other fertilizing salts — Commercial brands of potas- 

 sium chloride (muriate of potash) — Manufacture of potash from 

 felspar and other potassic minerals — Manufacture of potash from 

 sunflower stalks in the Caucasus 295-315 



