88 



HUMAN BIOLOGY 



acquiring an erect and perfect figure. 2. Should a hat be well venti- 

 lated? (A punch for making the holes costs a dime.) Should a hat 

 be stiff or soft ? 3. Name habits that im- 

 pair 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 ? 



FIG. 87. Suspenders 

 should have a pulley or 

 lever at the back, that the 

 strap on one side may 

 loosen when one shoulder 

 is raised. 



