464 MAN CONTROLS HIS ENVIRONMENT FOR HEALTH 



by handling or using articles, such as towels, handkerchiefs, cups, 

 or dishes used by sick persons ; or by drinking or eating foods 

 which have received some of the germs. 



Practical Exercise 4. Make a table to show all the ways in which bacteria 

 gain entrance to the body and name a disease which gets into the body under 

 each heading. 



Project. To make a curve showing decrease of tuberculosis in your 

 own state. (Use State Board of Health or Public Health Service 

 Reports for this and following projects.) 



Tuberculosis. One of the diseases responsible for the greatest 

 number of deaths, perhaps one tenth of the total on the earth, is 

 tuberculosis. Fisher estimates that tuberculosis has cost this 

 country between $500,000,000 and $1,000,000,000 a year, by its 

 toll of death, loss of work, maintenance of hospitals, sanitariums, 

 etc. But this disease is slowly but surely being overcome. It is 

 believed that within perhaps fifty years, with the aid of good laws 



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The number of death per 100,000 from tuberculosis has been steadily decreasing each year. 

 If this rate continues there will be very few deaths in 1940 from this disease. 



and sanitary living, it might become almost extinct. In 1900, the 

 death rate in the United States was 195.2 for each 100,000 inhab- 

 itants, in 1926 the death rate in the same area was only 84.5 per 

 100,000. In other words, according to Dr. Louis J. Dublin, there 



