Chapter 5

THE SOIL--ITS CHEMICAL AND PHYSICAL CHARACTERS.

The Origin of Soils ... Composition of Crystalline and Sedimentary Rocks ... their Disintegration ... Chemical Composition of the Soil ... Fertile and Barren Soils ... Mechanical Texture of Soils ... Absorbent Action of Soils ... their Physical Characters ... Relation to Heat and Moisture ... The Subsoil ... Classification of Soils 83