Page:First course in biology (IA firstcourseinbio00bailrich).pdf/554



acquiring an erect and perfect figure. 2. Should a hat be well ventilated? (A punch for making the holes costs a dime.) Should a hat be stiff or soft? 3. Name habits that impair the power of the lungs. 4. How could you convince a person that a bedroom should be open while and after it is swept? That it should be ventilated at night? 5. Which is the more injurious to others, tobacco chewing which causes the ground to be unclean, or smoking which renders the air impure? 6. Why do those who stand straight up to hoe not get tired half so quickly as those who bend or "hump" over? (Chap. VI.) 7. Why do students who sit in rocking chairs, or from other causes lean the head forward when they study, often find that they recover from drowsiness if they sit erect, or sit in a straight chair? 8. How are high collars a fruitful source of bad colds? 9. If the draft up the chimney of the fireplace, when the fire is burning, takes up a volume of air sufficient for many people, why is it unnecessary to open a window? 10. Why does cold impure air make a person colder than cold pure air? (p. 14.) 11. Do the modern customs of uniformity in dress for all classes and climates, shipping foods from great distances, one section or nation imitating the ways of another section or nation, lead toward health or disease? Do such customs violate or conform to the great biological law that life is a process of adaptation to environment?

should have a pulley or lever at the back, that the strap on one side may loosen when one shoulder is raised.