RESPIRATION AND EXCRETION 311 



7. Compare the ciliated cells of the windpipe with efficient 

 housemaids. 



Observation. Review your definitions of tissues and organs. 



Conclusions. 1. Show how tissues and organs may be com- 

 pared with companies and regiments of men. 



2. Show how division of labor is illustrated in the human 

 body. 



b. Special Questions 



1. What advantage in each cell doing only a special piece 

 of work instead of doing everything an animal needs to do, as 

 in the amoeba ? 



2. How does the efficiency of wild tribes of men compare 

 with civilized men ? What is the main difference ? 



3. What do we mean when we say "higher animals"? 

 Just in what sense are they " higher " ? 



4. Should men and women be educated to do the same 

 work? 



5. What is meant by the term " progress by specialization " ? 



6. Show how equal work, as between men and women, is a 

 violation of nature's law of progress, and would cause race 

 degeneration. 



7. What are tissues ? Organs ? 



8. Name some tissues in the human body. Why may they 

 be called " master tissues " ? 



9. Define the following terms: "anatomy," "physiology," 

 " hygiene," " biology." 



