For the improvement of science education and to facilitate the public understanding of science, the American Association for the Advancement of Science publishes this quarterly review of science books. Evaluations and annotations are given for trade books, textbooks, and reference works in the pure and applied sciences. Books are for students in elementary school, junior and senior high school, and the first two years of college, including selected advanced and professional books useful for reference by students and faculty members. Accompanying each annotation are symbols indicating its grade level and strength of recommendation. Also included is the yearly index to volume 6, May, 1970 - March, 1971. (BL)