356 A YEAR IN SCIENCE 



9. What causes the air to rush into the lungs? 



10. How is the thorax decreased in size? What 

 effect does this have on the amount of air in the 

 lungs? 



11. State some facts concerning the capacity of the 

 lungs. 



12. Of what use are the- air sacs? 



13. What changes take place in the air while it is 

 in the lungs? 



14. How can you account for these changes'? 



15. Describe foul air and its effect on health. 



16. Explain fully how to Tentilate a room. 



17. How much pure air is required for each person 

 per hour? 



18. Why should the air in a room be kept moist? 



19. What are adenoids? How may they interfere 

 with the health? 



20. Locate the tonsils. 



21. Name five so-called impure air diseases. 



22. Are they preventable diseases? 



23. Why should colds not be neglected? 



24. What was the death rate from tuberculosis in 

 Chicago* in 1910? 



25. How does this compare with the number of 

 deaths from smallpox? 



26. How can you account for this difference? 



27. Why is tuberculosis called the white plague? 



28. How may tuberculosis be spread? Suggest 

 methods for preventing its spread. 



29. Is tuberculosis hereditary? 



30. What can you personally do to guard against 

 contracting tuberculosis? 



31. What can you. do to help to decrease the 

 amount of tuberculosis? 



