Nuffield Combined Science, prepared for the first two years of British secondary schools (grades seven and eight, approximately), is described in SE 015 449. Teachers' Guide II and Activities Pack II contain the material developed for the following sections: Water; Small Things (microorganisms and particle theory of matter); Earth; Insects; and Energy. The material in these sections provides teachers with a set of ideas and advice based upon classroom trials that will enable them to select the appropriate activities for courses specifically designed for their own students. The materials are designed for flexibility, and more material is presented than could be taught in a two-year science program. See also SE 015 450. (AL)