RESPIRATION AND EXCRETION 301 



6. Why is it healthful to have a pan of water on the radi- 

 ator or stove ? 



7. What is a ventilator ? Explain one. 



8. How ventilate through the windows without causing a 

 draft ? 



9. How is your schoolroom ventilated ? 



10. Why should a hat be well ventilated ? 



11. Explain the advantage of using damp sawdust or tea 

 grounds when sweeping. 



12. What months are worst for hay-fever patients ? Explain. 



13. What are the best ways for keeping dust out of the 

 house ? 



14. Which becomes dusty sooner, an unpaved or a paved 

 street ? Explain. 



15. Are there any special liquids to prevent dust in rooms ? 

 In roads ? 



16. Which is more cleanly, gas light or electric light? 

 Explain. 



17. In what ways does street sprinkling favor comfort and 

 health ? 



18. What part of your city or town is dustiest ? Least 

 dusty ? Why ? 



19. Explain the advantages of the vacuum cleaner. 



20. Some of the advantages of traveling by boat ? 



21. What effect have autos and bicycles in stirring up dust ? 

 Preventive ? 



22. The effect of burning gas or lamps on the air in a room ? 



23. How can you tell when the air in a room is bad ? 



24. Name some ways of avoiding drafts in ventilation. 



Special Reports 



1. The need of ventilation. 



2. Sweeping and dusting. 



3. Hygienic habits of breathing. 



4. Tenement houses and ventilation. 



5. The black hole of Calcutta. 



