The image is a vintage, black and white illustration of a human tooth in a vertical section. The tooth is large and appears to be a molar, with multiple cusps and a complex root structure. The enamel is a dark, solid color, while the dentin and pulp cavity are lighter shades of gray. The root of the tooth is long and tapers to a point. The illustration is labeled 'FIG. 52. HUMAN TOOTH, VERTICAL SECTION.' and includes a magnification factor of 'x 8.' and a reference to page 167.