TABLE OF CONTENTS. 



PAGE 



Preface iii 



CHAPTER I. Discovery and Manufacture of Cyanamid ... i 



History of Technical Process i 



Nomenclature of Cyanamid Industry 3 



Manufacture of Commercial Cyanamid 4 



Preparation for Use as a Fertilizer 7 



Commercial Derivatives 8 



CHAPTER II. Preparation and Properties of Cyanamide 10 



Preparation 10 



Properties 11 



Action of Heat 1 1 



Action of Acids 12 



Action of Alkalies 12 



Action of Oxidizing and Reducing Agents 13 



Other Reactions 13 



Metal Salts 13 



Dimetal Salts 13 



Calcium Cyanamide 14 



Acid Calcium Cyanamide " 14 



Basic Calcium Cyanamide 16 



Calcium Cyanamide Carbonate 16 



Silver Cyanamide 17 



DICYANDIAMIDE 17 



Dicyandiamidine 18 



CHAPTER III. Anai^yticai, Methods 19 



Determination of Total Nitrogen 19 



Determination of Cyanamide and Dicyandiamide 20 



Caro Method 20 



Brioux's Modified Caro Method 21 



Determination of Urea 22 



Identification of Amidodicyanic Acid 23 



Identification of Ammeline 23 



CHAPTER IV. Storage of Cyanamid 24 



Factory Test on Large Scale 24 



Test of Two Bags 25 



Chemical Changes in Storage 28 



Relative Amounts of Decomposition Products 29 



CHAPTER V. Decomposition of Cyanamid in the Soii, 32 



Factors Involved 32 



Experiments of Ulpiani 32 



Experiments of Kappen 34 



First Stage of Decqpiposition 37 



Second and Third Stages of Decomposition 38 



Influence of Concentration 40 



Influence of Temperature 43 



Influence of Soil at ioo°C. 43 



