DEVELOPMENT OF VARIETIES 91 



of the wind has little effect in crossing such plants. It is 

 generally agreed that different varieties of plants pollenized 

 by insects should have at least 1000 feet between them to 

 prevent mixing, but this will often occur to some extent 

 even with these precautions. The greatest care should be 

 taken to keep stock seed from being mixed. 



REVIEW QUESTIONS 



1. How are seeds tested? 



2. How are jeeds cured and stored? 



3. What is meant by stock seed? Specialties? Humbugs? 

 Novelties? 



4. Illustrate the law that the constant tendency for cultivated 

 plants is to vary widely from the original form. 



5. Illustrate the law that the qualities of the parent are more 

 likely to be transmitted than the desirable qualities of a few individual 

 fruits. 



6. Why is it a poor plan to select seed from plants remaining in 

 the garden late after the best specimens have been gathered? 



7. What is meant by cross-and self-pollination? 



8. What is the effect of cross-and of self-pollination? 



9. How can the mixing of varieties be prevented? 

 10. How are plants pollenized? 



