The image is a detailed, vintage biological illustration of a diatom, a type of microscopic algae. The diatom is oval-shaped and appears to be viewed from above. Its structure is characterized by a radial symmetry, with numerous tiny, circular or elliptical pores arranged in a pattern that radiates from the center. These pores are interconnected by fine, linear structures, creating a network-like appearance. The illustration is rendered in black ink on a cream-colored background. The level of detail is high, suggesting a magnification of 1000x, as indicated by the text below the image. The illustration is labeled 'Diatom, from Bori, Hungary' and 'Fig. 5'. There are also page references at the bottom left and right corners ('to face page 17' and 'see page 110'). The style of the illustration is reminiscent of scientific drawings from the 19th or early 20th century.