NATURE-STUDY LESSONS. 13 



9. How can you determine on entering a room whether 

 it has been recently ventilated? 



10. Infer of what special value the sense of smell is to 

 man. 



11. Give other examples in which the sense of smell 

 protects man. 



12. Why do persons use perfume? 



1 3. What are the uses of the sense of smell ? 



D. Sense of Smell in Inferior Animals. 



14. Observe how the different animals make use of this 

 sense. 



(a) Why are flowers odorous ? 



(J)) How are insects guided to flowers ? 



if) How does a dog search out his master ? 



{d) How do some dogs follow rabbits, deer and 



other animals of the chase? 

 (e) Account for the position in which a dog holds 



his head while hunting. 

 :(/) How do crows and other carrion birds know 



where a dead animal lies ? 



E. How to Train the Sense of Smell. 



1 5. Examine such objects as the following and observe 

 their odors : — Apples, pears, oranges, lemons, pineapples, 

 pepper, celery seed, caraway, sage, etc. 



16. With closed eyes name objects by smelling them, 

 as ginger, lemon, pepper, camphor. 



17. With eyes closed determine the names of flowers 

 and plants by their odor. 



18. Name the substances kept in unlabelled vials. 



The teacher may put peppermint and other essences, rose and other 

 perfumes, turpentine and other oils, etc., in vials to be kept in the school- 

 room and used for sense-training. 



