A practical laboratory manual that presents methods for sampling, drying, incinerating, and extracting organic agricultural materials and for analyzing their constituents. It surveys physical and chemical techniques used to determine carbohydrates—including density measurements, polarimetric and reducing-sugar assays—and addresses starch hydrolysis, oils and fats, and analyses of dairy and animal products. The text emphasizes sample preparation, apparatus design, procedural variations, sources of error, and calculation steps, supplying illustrated guidance and adaptable procedures to help analysts and students perform accurate compositional determinations.