Each figure citation in the text pertains to a single illustration. Each figure is labelled on the back with the figure number and an arrow indicating the top. For black and white line drawings and images, the labelling information is provided on a gummed label affixed to the back of the print. The authors' names do not appear on the figure labels. Only arrows, letters and other pointers have been used on the figures.
Symbols are uniform in size and style.
Line drawings have been done in black ink on a white background. The same size of type has been used on each line drawing. Line drawings are submitted separately, as for other illustrations, and are not incorporated into the body of the text. Drawings are either originals or print-outs from a laser printer. Photocopies are not acceptable.