This is a vintage black and white illustration of a chimpanzee's head, drawn in a detailed, realistic style. The chimpanzee is depicted in profile, facing left. Its fur is rendered with a multitude of short, fine lines, creating a textured appearance. The face is expressive, with a slightly downturned mouth and a look of disappointment or sullenness. The eyes are large and dark, adding to the emotional quality of the portrait. The artist has paid close attention to the anatomy of the chimpanzee's face, capturing the shape of the skull, the prominence of the brow ridge, and the structure of the jaw. The illustration is signed 'Wood' in the lower left corner, and a caption below reads 'Fig. 18. Chimpanzee disappointed and sulky. Drawn from life by Mr. Wood.' The background is lightly shaded with vertical lines, providing a subtle contrast to the chimpanzee's face.