CONTENTS Vll 



the alcohol method; Variation of Marioni and Tasselli; Method of Krug 

 and McElroy; Method of Wyatt; Separation of iron and aluminum 

 phosphates ; Methods of the German fertilizer association ; French meth- 

 od; Method of Lasne; Comparison of methods for iron and alumina; 

 Sources of error; Effect of iron salts; Effect of calcium salts; Effect of 

 sulfates; Effect of fluorin; Separation of alumina with phenylhydrazine ; 

 General conclusions. 



Occurrence of Fluorin in Phosphates, pp. 261-276. Significance of 

 fluorin ; Method of Berzelius ; Chatard's modification ; Wyatt's modifica- 

 tion ; Method of Rose ; Burk's modification of Carnot's method ; Method 

 of Lasne ; Carnot's modification ; Protection of glassware from fluorin ; 

 Fluorin in bones ; lodin in phosphates ; Chromium in phosphates ; Vanad- 

 ium in phosphates. 



Superphosphate Manufacture, pp. 277-286. Chemical changes in manu- 

 facture ; Reaction with fluorids ; Reaction with carbonates ; Solution of 

 the iron and alumina compounds; Quantity of sulfuric acid; Use of 

 phosphoric acid; Fixation of phosphoric acid; Absorption of phosphoric 

 acid; Availability. 



PART SECOND 



Nitrogen in Fertilisers, Drainage Waters, Hie., pp. 287-300. Kinds of 

 nitrogen in fertilizers; States of nitrogen; Nitrogen in seeds and seed 

 residues; Nitrogen in seaweed; Dried blood and tankage; Horn, hoof, 

 and hair ; Nitrogen in fish ; Nitrogen from birds ; Waste nitrogen ; 'Nitro- 

 gen in soils; Deposits of nitrates; Quantity of nitrates used; Nitrate 

 deposits in Chile ; Nitrate deposits in California ; Functions of sodium 

 nitrate; Composition of nitrate deposits; Commercial forms of nitrates; 

 Composition of Chile saltpeter; Application of saltpeter to the soil. 



Utilization of the Nitrogen of the Air as a Fertilizing Material, pp. 

 301-320. Activity of leguminous plants; Activity of other than legumin- 

 ous plants ; Accumulation of atmospheric nitrogen in the soil ; Manufac- 

 ture and use of cyanamid ; Cyanamid compound as a fertilizer ; Utiliza- 

 tion of atmospheric nitrogen ; Development of the fixation of atmos- 

 pheric nitrogen; Properties of calcium cyanamid; Production of nitric 

 acid by electric action; Method of Birkeland and Eyde; Manufacture 

 of nitrate of lime ; Quantity of nitric acid by electric action ; Absorption 

 and concentration of product; Method of Moscicki; Production of 

 nitric acid in the United States by electric action. 



Methods of Determining Nitrogen. Volumetric Method, pp. 321-337. 

 Classification of methods ; Determination of state of combination ; 

 Microscopic examination; Official method; Copper oxid method; Note 

 on copper oxid method; Description of apparatus; Variation of Bureau 

 of Chemistry method of Johnson and Jenkins; Calculating results; 



