Diseased bone; ankylosis and necrosis, shown in 17 numbered illustrations. Examples of ankylosed hip joint, shown intact and in cross-section. Examples of an ununited fracture of the femur. Various examples of bone necrosis, shown in the humerus, femur, tibia, fibula and clavicle. Examples of hyperostosis, shown in the tibia, fibula and femur. All examples shown in isolation.