IMPROVING QUALITIES 503 



4. What differences are there in a given lot of seeds (or leaves, in- 

 sect wings, thumbs, flowers, or other natural objects) of the same kind ? 



5. What is the advantage to man of cultivating or domesticating ani- 

 mals instead of using wild ones ? What is the disadvantage ? 



6. What are the advantages of cultivating or domesticating plants 

 instead of using wild ones ? What are the disadvantages ? 



7. What are the advantages that some breeds of domesticated ani- 

 mals raised in your region have over some other breeds ? What are the 

 disadvantages ? 



8. What are some of the advantages that some of the breeds of 

 domesticated plants raised in your region have over other breeds ? What 

 are the disadvantages? 



9. What is there in your region to show that some ways of managing 

 plants are more productive than other ways ? 



10. What is there to show that some kinds of management in plant- 

 raising result in better qualities ? 



11. What is there in your region to show that some ways of managing 

 animals are more productive than other ways ? 



12. WTiat is there to show that differences in management bring about 

 differences in the quality of domestic animals? 



13. How can you tell w^hether the differences observed between two 

 individuals of the same kind are due to differences in ancestry or breed, 

 or to differences in the conditions under which they developed ? 



14. What would be the use of knowing how various kinds of differ- 

 ences are produced ? 



15. What modern plants or animals were not cultivated in ancient 

 times ? 



16. What domestic plants or animals are being replaced by new 

 sources of supply or made unnecessary by new ways of living ? 



17. What plants or animals that were formerly cultivated are no 

 longer of great importance ? 



18. Look over the classification of plants and that of animals (Chap. 

 VII) and list those groups from which we have cultivated or domestic 

 representatives. 



REFERENCE READINGS 

 (See reading lists on pages 518 and 531) 



