The volume systematically explains the nature and origin of soils and the minerals and processes that produce them; it outlines standardized methods for taking and preparing samples and for mechanical and chemical laboratory treatment. It examines physical properties including texture, cohesion, absorption, porosity, heat relations, and moisture movement, and describes instruments and procedures for measuring specific heat, soil temperature, capillarity, permeability, and silt composition. Practical guidance on apparatus design, experimental technique, and quantitative analysis is provided throughout to enable consistent assessment of soil composition and behavior for agricultural purposes.