HUMAN ANATOMY, early 20th century, Germany, wax models of a human jaw transitioning from newborn to adult, showing the evolution of human tooth development, 'The Development of the Human Set of Teeth', with diagram over the human mouth, together with three trays of wax models of cross-sectioned teeth and gums, each outlining tooth and gum diseases and their treatments, 'Conservation of Decayed Teeth', 'Diseases of the Teeth', and 'Treatment of Diseased Pulps', largest 30 x 45cm (4)