This unit emphasizes concept-learning through the discovery approach and child-centered activities. "Discovering Matter" is treated in the kindergarten, "Matter Around Us" in grade 1, "Changes in Matter" in grade 4 and "Atoms and Molecules" in grade 6. The unit for each grade contains (1) understandings to be discovered, (2) activities and (3) activities to assign for homework or individual research. Each activity is introduced by a "leading question," followed by a list of materials and a description of the procedure to be followed. Children are taught to observe, infer, discuss problems and use reference and audio-visual aid materials. There is an index of science textbooks for reference for the teacher. The appendix contains listings of (1) common chemicals, (2) useful equipment, (3) laboratory procedures, (4) important chemical principles, and (5) chemical elements and their general characteristics. [Not available in hardcopy due to marginal legibility of original document.] (LC)