o:>' 



BIOLOGY AND HUMAN LIFE 



13. How does travel to new regions bring dangers to health ? 



14. Why are the death rates higher for some diseases than for others ? 



15. Why are the death rates for a given disease higher in one state or 

 city than in another ? 



16. What use can we make of a comparison of death rates of different 

 communities for different diseases ? What use can we make of a com- 

 parison of the death rates for various diseases in our community with 

 the death rates in other communities ? 



17. What diseases have shown diminishing danger in your community 

 during the past ten years? What brought about the change? 



18. W^hat diseases have shown increasing danger in your community 

 during the past ten years ? What brought about the change ? 



19. If we know that some diseases increase their injury to the com- 

 munity, and others diminish their injury, what can we do with the 

 knowledge ? 



REFERENCE READINGS 



Hough and Sedgwick. The Human Mechanism, chap, xxxii, Some 



Parasitic Diseases and their Prevention. 

 Fanners' Bulletin 44g, Rabies or Hydrophobia, 

 Fanners' Bulletin io6g. Tuberculosis in Live Stock, Detection, Control, 



and Eradication. 

 Bureau of Animal Industry. Circular igo, Vaccination of Cattle against 



Tuberculosis. 

 Bureau of Animal Industry. Bulletin 121, Need of Controlling and 



Standardizing Veterinary Tetanus Antitoxin. 

 United States Department of Agriculture. Circular 24g, Tuberculin 



Testing of Live Stock. 

 United States Department of Agriculture. Bulletin 70, Immunization 



Tests with Glanders Vaccine. 

 United States Department of Agriculture. Bulletin 166, Ophthalmic 



Mallein for Diagnosis of Glanders. 

 Public Health Reprint 778, Diphtheria, its Prevention and Control. 



