DIRECTIONS FOR CONDUCTING A SERIES OF SCIENCE EXPERIMENTS ARE PRESENTED. THE EXPERIMENTS CONCERN THE STUDY OF HEAT AND MOLECULAR MOTION, HEAT EXCHANGE IN A MIXTURE, SPECIFIC HEAT, HEAT AND SIZE, EXPANSION OF LIQUID, EXPANSION OF AIR, HEAT OF FUSION OF ICE, HEAT OF VAPORIZATION OF WATER, LIGHT AND SOUND, LAW OF REFLECTION, PLANE MIRROR IMAGES, REGULAR VERSUS DIFFUSE REFLECTION, REFRACTION, CONVEX LENSES, LAW OF INVERSE SQUARES, DISPERSION OF LIGHT, AND LINES OF FORCE. PERTINENT QUESTIONS TO GUIDE OBSERVATIONS ARE GIVEN FOR EACH EXPERIMENT. A LIST OF EXPERIMENTS WHICH INVOLVE RESEARCH ON THE PART OF THE STUDENT IS INCLUDED. THE STUDENT IS TO LOOK UP THE MEANING OF THE TERMS AND THEN DEVISE AN EXPERIMENT TO DEVELOP HIS THINKING ALONG SUCH LINES. THE SUBJECT-TERMS TO BE RESEARCHED ARE--A SOLENOID, A VOLTAIC CELL, AN ELECTROMAGNET, A SIMPLE SERIES CIRCUIT, A SIMPLE PARALLEL CIRCUIT, AND ELECTRONIC METERS, VOLTMETER, AND AMMETER.