III. OTHER FACTS ABOUT HEAT

IV. BURNING OR OXIDATION

V. FOOD

VI. WATER

VII. AIR

VIII. GENERAL PROPERTIES OF GASES

IX. INVISIBLE OBJECTS

X. LIGHT

XI. REFRACTION

XII. PHOTOGRAPHY

XIII. COLOR

XIV. HEAT AND LIGHT AS COMPANIONS

XV. ARTIFICIAL LIGHTING

XVI. MAN'S WAY OF HELPING HIMSELF

XVII. THE POWER BEHIND THE ENGINE