Chances of Life 255 



common clovers, require insects with trunks of some 

 length, because their nectar is so deeply hidden that none 

 but these can reach it. And insects do not visit flowers 

 where there is nothing to be gained. 



Composite flowers, such as the daisy, dandelion, camo- 

 mile, groundsel, and many others whose blossoms grow 

 together in flat heads, are easily fertilized by almost any 

 insects; and what with this advantage, and the further 

 one that so many of the family have downy seeds easily 

 carried by the wind, composites are among the most thriv- 

 ing and successful emigrants. 



QUESTIONS FOR REVIEW 



1. What questions, difficult to answer, are suggested by the 

 seeds of various plants? 



2. What interesting cases have been known of seeds which 

 kept their life for hundreds of years? 



3. What truth is suggested by the fact that the wild orchis 

 does not increase? 



4. What difficulties may plants encounter in new localities? 



5. What may happen to seeds before they even begin to 

 grow? 



6. How do some seeds bury themselves? 



7. What difficulties does the Brazil-nut encounter? 



8. What change was brought about by cattle in New South 

 Wales? 



9. Give examples of seeds helped by being scorched, boiled, 

 and soaked. 



10. Why have European seeds flourished in the United 

 States? 



11. How do Western plants migrate? 



12. What fact is illustrated by the Pampas district of South 

 America? 



13. Why are composites apt to be successful emigrants? 



