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despite the accumulations of humus over a period of many years; therefore "blowouts" can occur at any time returning the area to sand, and the cycle begins again. audience: High school; college THE TROPICAL RAIN FOREST Color—Sound Encyclopaedia Britannica Films, Inc. 17 minutes Rental—Sale Since the tropical rain forest contains the largest variety of plant and animal life of any biome, it is hard to describe in a short film. This particular one represents the outstanding effort on the topic to date. The layered structure of vegetation is clearly portrayed through the use of drawings and photographs. The conditions of soil, temperature, and moisture peculiar to this area are also well presented. Comparison to the temperate deciduous forest with which more students would be familiar helps to explain this particular forest. In depicting the fauna little time is spent on the larger animals— relatively unimportant in the system; principal attention is given to the dominant animals of each layer—birds, monkeys, and the most numerous of all, the arachnids of the forest fioor. The film is distinguished by some unusually fine photography and the judicious use of natural sounds. audience: High school; college; adult WHAT IS ECOLOGY? Color—Sound Encyclopaedia Britannica Films, Inc. 11 minutes Rental—Sale As an introduction to the study of ecology, this film is both brief and thorough. The basic concepts of the subject are presented through the introduction of the major biomes of the world with brief descriptions of environmental characteristics including typical plants and animals. Titles superimposed over these sequences point out the applications of ecology's specialized terms. The study of ecology is given its proper importance from the opening scene. An auction of a farmer's machinery and household effects is in progress; he failed because he did not consider eco- logical principles in his farming. Shots of the dust bowl and the 37