The annotated illustrations of biological specimens useful for illustrating the "tropical" topics dealt with in African secondary school biology courses are designed to serve a two-fold purpose. The diagrams are intended to show the pupil the structures he should be looking for in his laboratory work, with the textual material being an addition to his class notes. It is also intended to assist teachers new to tropical countries to become familiar with appropriate organisms to use in biology teaching. Topics covered include flower structure and pollination; seed structure, dispersal and germination; modifications of stems, leaves and roots, including food storage and vegetative reproduction; plant life cycles; complete and incomplete insect metamorphosis; and structure of fish, amphibia, reptiles, birds, and mammals. Notes on the biological and economic importance of the forms illustrated are usually included. A species index and a short bibliography are also included. (AL)