Illustrations must be restricted to the minimum needed to clarify the text. Previously published illustrations are usually not accepted. Explanations of figures furnished as legends should not be repeated in the text. Numerical data given in graphs or tables must not be duplicated. All figures, whether photographs, graphs, or diagrams, must be mentioned in the text, and the top of the figure, the title of the paper, the author's name, and the figure number should be marked lightly on the back in soft pencil.
All figures are to be numbered consecutively throughout and submitted separately.
Whenever possible, several figures should be grouped into a plate on one page. Please submit high-quality glossy prints in the desired final size. The inscriptions should be clearly legible. Letters 2 mm high are recommended. Sharp, well-contrasted photographic prints trimmed at right angles and in the desired final size are acceptable.