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out the great spans of geological time necessary for major changes in the earth's form and structure. The Grand Canyon is used as an example of the formation of a great part of the earth. Of particular interest to ecologists, it offers a valuable introduc- tion to the study of eras and epochs by giving many examples of erosive action, particularly water, wind and frost. An elaborate production in terms of music, narration and scope of story. AUDIENCE: Junior high; senior high; college; adult THE LIVING FOREST SERIES Color—Sound Encyclopaedia Britannica Films Three parts; Rental—Sale 33 minutes complete PART I—THE FOREST GROWS Different types of trees and forests, together with the climatic and geographical variations which cause these differences, are de- scribed. The film next defines these trees as citizens of the forest community and demonstrates the duties they perform in this role. Photosynthesis and growth are shown in remarkable time-lapse photography. The changes in growing conditions from valley floor to mountain top, and the resulting difference in forests and ground cover, are then covered. The film goes on to explain the growth and development of a typical New England forest, including the roles of weather, animals, and the trees themselves. Finally it shows how an overmature forest can be brought back to life by the under- standing care of man. PART II—THE FOREST PRODUCES The forest's three gifts to mankind are described in this film. The lumber industry and its many products are sketched first. Water is shown as the most important gift of the forest, and the film explains how trees and forests help mountains store water and regulate its flow, and how the water thus saved carries life to thou- sands of acres of arid land. The third gift of the forests, provisions of places of beauty and relaxation, concludes the film, with scenes of our national parks and forests, and the geological history and wildlife observable within. The reminder is made that man can continue to receive these gifts as long as he manages his forests wisely.