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เนื้อหาย่อ : In this age of nuclear energy and space exploration, science is an integral part of daily lives. People of all ages have the incentive to learn the basic physical prin- caiples which govern the world they live in. The authors of SCIENCE believe that a course in general science should give the student an orderly understanding of the aterials and forces which make up his environment. This course should also give firsthand experience with the scientific method used in solving problems, and should help him adjust his life to the rapid strides which are being made in science. With these objectives in mind, the authors have chosen the subject matter of SCIENCE with careful regard for those materials which various state and city syl- labi indicate should constitute an ideal curriculum in general science. Realizing that the nature and extent of the science taught in the elementary grades vary from ol to school, and even within school systems, the authors have me variation in student needs by providing in the nineteen units of this textbook a com- te program covering the major areas of science. Allowing for the usual sequence, major emphasis is based on the physical sciences because few students will take further work in physics or chemistry. This revision includes a new unit on how man is conquering the problems of space travel. This unit discusses the prin- ciples of rocketry and satellite motion and current and future government programs ace exploration. The authors have also included a new unit on hov d to release and control nuclear energy. The principles of radioactivity detection and measurement are explained, as is the harnessing of nuclear power for peaceful uses and the dangers of radiation. The biological areas are represented by discussions of basic principles and ap- plications which serve as a stepping stone for the many students whose further courses may include a year of biology. The content has been tested in the authors' own classrooms many times and under various conditions, and the reactions of students to it have been taken into con- ation in revising each unit. This classroom testing has indicated th want to know the what, the how, and the why of scientific phenomena. Descriptive materials in the text, actual demonstrations by the instructor, and activities which the student performs himself help him learn what happens and how it happens, wer to the why will come only from explanation, reasoning an tation. Great care has been given to the development of a logical sequence leading to the inductive discovery by the student of each scientific principle and its applica- tion. All the nineteen units are organized around a large problem based on a special division of subject matter. This large problem is then subdivided into smaller assign-