QUESTIONS AND SUGGESTIONS 509 



and produce an immunity. Experiments have been made in 

 France and are now being conducted at Harvard and Yale uni- 

 versities with this material. Watch for results of the work. The 

 problem of immunity is still far from its solution. Scientists are 

 just beginning to solve many of the questions. You who are to 

 be scientists of to-morrow will have opportunity for research in 

 this and many other fields of biology. 



QUESTIONS AND SUGGESTIONS 



1. Discuss Metchnikoff's experiments with phagocytes. 



2. Give a report on the life and work of Metchnikoff. 



3. Discuss Ehrlich's experiments with dyes and chemicals on 

 bacteria. 



4. What theory of immunity was founded by Ehrlich ? 



5. Give some interesting facts about the life and work of Ehrlich. 



6. Discuss natural immunity ; acquired immunity. 



7. What test may be used to see whether a child is or is not 

 naturally immune to a certain disease ? 



8. What specific inoculations should be given all children to make 

 them actively immune to diseases with which they come in contact ? 



9. What specific inoculations should be given a person who is 

 traveling to make him actively immune to diseases with which he 

 might come in contact? 



10. State two differences between active and passive immunity. 



11. Under what conditions will a person be actively and passively 

 immunized against diphtheria ? 



12. Answer some objections that may be currently raised against 

 immunization. 



