CAUSATIVE ORGANISM 



443 



them from growing. In the latter case the germs are still alive 

 and will become active again, whenever the resistance is weakened 



REGIONAL INCIDENCE OF TUBERCULOSIS MORTALITY 

 IN THE UNITED STATES 



Adjusted* Deathrates per 100,000. Tuberculosis -all forms. 1922 



WHITE POPULATION** 



State 



COLORADO 



CALIFORNIA 



TENNESSEE 



KENTUCKY 



DELAWARE 



MARYLAND 

 i NEW YORK 

 1 RHODE ISLAND 



VIRGINIA 



HEW JERSEY 



MISSOURI 



CONNECTICUT 



MASSACHUSETTS 



VERMONT 



PENNSYLVANIA 



HEW HAMPSHIRE 



INDIANA 



OHIO 



MAINE 



ILLINOIS 



NORTH CAROLINA 



WASHINGTON 



WISCONSIN 



1216 

 1159 

 969 

 930 



ei s 



91.4 

 912 

 907 

 006 

 900 

 076 

 67.7 

 660 

 046 

 010 

 612 

 601 

 79.7 

 750 

 731 

 70.0 



WHITE POPULATION** 



State Pate 



OREGON 



MINNESOTA 



MICHIGAN 



FLORIDA 



MONTANA 



SOUTH CAROLINA 



MISSISSIPPI 



KANSAS 



UTAH 



NEBRASKA 



ao zoo uo joo 



Pates adjusted for differences of sex and age constitution of population. 



* * Includes Skates with populations containing number or proportion of colored 

 persons insufficient to warrant separate tabulation. 



Make a graph from the latest figures of your own and neighboring states and compare it 

 with this chart. Give the possible reasons for a high mortality among the colored population. 



(From Health and Wealth by Dublin, Harper & Bros.) 



by infection, malnutrition, overwork, and fatigue. Data concern- 

 ing the prevalence of tuberculosis in childhood and the subsequent 

 recovery of the children from it is known, because investigation 

 proves that the lungs in practically every dead body examined 

 and the X-rays of living lungs show old scar tissue. The scar tis- 

 sue is characteristic of tuberculosis attacks. Bacilli that get into 

 the blood are frequently carried to a lymph gland, where white 

 corpuscles in great numbers attack and destroy them. The body, 

 meanwhile, builds a hard wall of lime salts around the infected 

 gland, so that the infection is thus removed from the circulation. 

 Sometimes infected glands are cut out to prevent the spread of 

 the germs. Tuberculosis is not hereditary, but susceptibility to 



