re-writing of the second edition when it shall be demanded, in order to keep it abreast of the rapid progress in the field of agricultural chemical analysis. WASHINGTON, D. C., Beginning of January, 1897. TABLE OF CONTENTS OF VOLUME THIRD. PART FIRST. SAMPLING, DRYING, INCINERATION AND EXTRACTIONS. _Introduction_, pp. 1-3.—Methods of study; Scope of the work; Limitations of work; General manipulations. _Methods of Sampling_, pp. 3-13.—Vegetable substances; Animal substances; Preserving samples; Collecting samples; Grinding samples; Grinding apparatus. _Drying Organic Bodies_, pp. 13-36.—Volatile bodies; Drying ovens; Air baths; Drying in vacuum; Electric drying ovens; Steam coil apparatus; Drying in hydrogen; Drying in tubes; Drying viscous liquids; General principles of drying. _Incineration_, pp. 36-40.—Principles of incineration; Products of combustion; Purpose and conduct of incineration; German ash method; Courtonne’s muffle. _Extraction of Organic Bodies_, pp. 40-57.—Object of extraction; Solvents; Methods of extraction; Extraction by digestion; Extraction by percolation; Apparatus for extraction; Knorr’s extraction apparatus; Soxhlet’s extraction apparatus; Compact extraction apparatus; Recovery of solvents; Authorities cited in Part First. PART SECOND. SUGARS AND STARCHES. _Introduction_, pp. 58-62.—Carbohydrates; Nomenclature; Preparation of pure sugar; Classification of methods of analysis. _Analysis by Density of Solution_, pp. 63-72.—Principles of the method; Pyknometers; Calculating volume of pyknometers; Hydrostatic balance; Areometric method; Correction for temperature; Brix hydrometer; Comparison of brix and baumé degrees; Errors due to impurities.