Contents: 1. Colloidal State; 2. Properties of Colloids; 3. Thermodynamics of Surfaces; 4. Charged Interfaces; 5. Adsorption at Interfaces-I The Solid-gas Interface; 6. Adsorption at Interfaces-II The Solid-Liquid Interface; 7. Adsorption at Interfaces-III; 8. Emulsions and Foams; 9. Stability of Colloids; 10. Applications of Colloids