_Introduction_, pp. 1-4.—Natural fertilizers; Waste matters as fertilizing materials; Valuation of fertilizing ingredients. _General Analytical Processes_, pp. 4-15.—Taking samples; Fertilizing minerals; Mixed fertilizers; French methods of taking samples; Sampling stable manures; Preparation of sample in laboratory; French and German methods; Drying fertilizer samples; Moisture in acid phosphates. _Analysis of Mineral Phosphates_, pp. 15-39.—Constituents to be determined; Direct estimation of phosphoric acid; Official method; Preparation of solution; Use of tartaric acid; Determination of water and organic matters; Carbon dioxid; Soluble and insoluble matter; Silica and insoluble bodies; Estimation of lime; Ammonium oxalate method; Immendorff method; Estimation of iron and alumina; The acetate and Hess methods; Methods of Jones and Crispo; Geological Survey method; Method of Marioni and Fasselli; Method of Krug and McElroy; Method of Wyatt; Estimation of magnesia; of sulfuric acid; of fluorin. _General Methods for Phosphoric Acid_, pp. 39-57.—Preliminary considerations; Estimation as stannic phosphate; Water soluble acid; Citrate insoluble acid; Total phosphoric acid; Norwegian methods; German experiment station methods; Soluble phosphoric acid; Swedish methods; Dutch methods; Errors in molybdate method; Color of pyrophosphate; Solution in sulfuric acid. _The Citrate Method_, pp. 57-70.—General principles; Halle method; Swedish method; Methods adopted at the Brussels Congress; Dutch method for citrate soluble acid; Comparative accuracy of citrate and molybdate methods. _Basic Phosphatic Slags_, pp. 70-86.—History and manufacture; Composition; Molecular structure; Solubility; Separation and solution; Estimation of total acid; Alternate method; Halle method of analysis; Dutch method; Estimation of citrate soluble acid in basic slags; Wagner’s shaking and digesting apparatus; Estimation of caustic lime in slags; Detection of adulteration. _Volumetric Determination of Phosphoric Acid_, pp. 86-106.—Classification of methods; Uranium method; Preparation of sample; Precipitation of the phosphoric acid by magnesium citrate; Composition of magnesium citrate solution; Solution of ammonium magnesium phosphate; Preparation of standard solutions; Verifying standard solutions; Conduct of the analysis; Phosphoric acid in superphosphates; Determination of soluble and reverted phosphoric acid; Conclusions.