The course presented in these two textbooks is an experimental integrated science course that is closely based upon the syllabus prepared by the Working Party on Secondary School Science (SE 015 432). The course, intended for all students in the first two years of Scottish secondary schools (grades eight and nine, approximately), interweaves topics from physics, chemistry, and biology topics to stress the general principles of science. Book 1 presents materials for the following units: Introducing Science; Looking at Living Things; Energy; What Are Things Made of?; Solvents and Solutions; Units of Life; Electricity; and Some Common Cases. Book 2 contains units 9-15: Heat Flow; Hydrogen, Acids, and Alkalis; Detecting the Environment; The Earth and What We Get from It; Support and Movement; Transport Systems in Living Things; and Electricity and Magnetism. Each volume contains text descriptions of phenomena, suggestions for experiments and investigations, and questions to promote thinking. The units are presented in one possible teaching order but are, in most cases, relatively independent, and teachers are expected to treat sections in different sequences to suit local conditions. See also SE 015 432, SE 015 433, and SE 015 434. (AL)