Toc: Chapter 1.- The nature and classification clays and soils. Chapter 2.- Physical geology. Chapter 3.- The origin and evolution of clays minerals and clay. Chapter 4.- Composition and fabric of clays. Chapter 5.- Physical chemistry of clays. Chapter 6.- Moisture interaction with clay minerals. Chapter 7.- Strength and rheology of clays. Chapter 8.- Soil stabilization. Chapter 9.- Clays as materials. Chapter 10.- The mineralogical analysis of clay. Chapter 11.- Physical analysis of clays. Chapter 12.- Engineering analysis of soil.