Do not forget to mention the units used in diagrams. Each illustration should have a caption. The captions should be collected on a separate list at the end of the manuscript. Explanations should be given in the typewritten legend. Drawn text in the figures should be kept to a minimum.
Photographs are only acceptable if they have good contrast and intensity.
Sharp, glossy copies are required. Reproductions of already printed photographs cannot be accepted. Colour illustrations cannot usually be included, unless paid for by the author. All references to publications made in the text should be presented in a list of references following after the text. The list should preferably only contain references which are cited in the text.