What is a magnet? What are the poles of a magnet? What is a temporary magnet? - What is a magnetic field? Electric magic. Are all electric charges alike? How does a lightning rod protect a house? - Where does an electric cur- What is an electromagnet? How do we ring an electric bell? How can a telegraph wire carry a message? - Why can we see objects? How does sunlight travel? How does a mirror change light? Why does an object have glass work? How does light form an image? camera work? - What is the color of sunlight? rainbow? Why does an object have color? How can we How do we get sunlight into the house? How have men lighted their houses at night? How do kerosene lamps work? - an echo? What is the difference between noise and tone? pulleys help us? How do we use a wheel and axle? Of what How does a sailboat use the wind? Why do kites fly? Why do airplanes rise? - Why do windmills turn? - How has - - How is cream separated from milk? vacuum cleaner work? - How can we wash clothing by elec- How does man make use of plants? - Loes man eat grass? How are trees our friends? How does a tree get its shape? What is the inside of a tree like? What are sapwood and How many kinds of animals are there? - Have animals helped, or hindered, man's progress? What are man's beasts of burden? What animals give us meat? Why is milk valu- be destroyed? - - Exercises and summary. bones grow? Why do we have joints? What is the skeleton. What organs digest our food? How does the mouth help in digestion? What is the work of teeth? How do we What is the work of white corpuscles? - How is bleeding stopped? - How does the heart pump the blood? - How do arteries differ from veins? Does an artery bleed like a vein? What are capillaries? How does food get to the cells? How does the blood get rid of cell wastes? - Exercises and sum- How does inhaled air get to the - What are the lungs like? What is the voice? -- Do the organs of respiration need care? - What is the structure of the skin? - How do hair and nails grow? -- What is the work the brain? cord like? -- - What is the brain like? What is the spinal -- |