can you keep your teeth quite free from scraps of food? 6. Why are
teeth necessary? How must they grow to make good cutting tools? If
they are not straight or sound, what can you do about it? 7. Why ought
children's first teeth to be thoroughly brushed every day?

II. THE LAND OF NOD. 1. When you are ready for bed, how do you
fix your windows? Why is it even more necessary to have the air
blowing through the room at night than in the daytime? 2. How else is
your body being purified at night? Does your body do any work while
you are sleeping? What work? 3. What kind of sleep should you have if
you are perfectly well?