THE UNITY OF LIFE 215 



4. What is there in an insect's body that corresponds to the red 

 corpuscles of our blood ? In what sense does it correspond ? 



5. How does locomotion among insects resemble that among mam- 

 mals and plants ? How does it differ ? 



6. What advantages come to a living thing through the division of 

 labor among organs and tissues ? What disadvantages ? 



7. What are the conditions for a high degree of division of labor 

 among human beings ? among different nations ? 



8. What are some of the advantages of carrying the division of 

 labor still farther among individuals ? among nations ? What are the 

 disadvantages ? 



9. Is a person with a special talent better off in a large community 

 or in a small one ? Why ? How about a person with a special handicap ? 



10. How can organisms without breathing organs breathe ? 



11. How can plants and animals digest without stomachs? 



12. How can a man live after his stomach is removed by a surgeon ? 



13. How can we show that the activity of one part of the body may 

 interfere with the full activity of another part ? 



14. How can we show that the activity of one part depends upon that 

 of another ? 



REFERENCE READINGS 



Beebe. William. Jungle Peace. ''The Army Ants of Guiana" (extract 



in C. H. Ward's ''Exploring Nature," pp. 96-100). 

 CocKERELL, T. D. A. Zoolog>% chap. vi, The Individual. 



