Geographic Variations in Typhoid, Etc. 



59 



Certain special conditions doubtless help explain the peculiarities of 

 figure 5. For example, Parke County is black partly because of its 

 large tuberculosis hospital, in which many patients from other counties 

 and states die. Another special condition has been suggested, namely 

 that the doctors in the poorer counties of the southern part of the state 

 are older on the average than those in the more industrial and richer 

 central and northern counties, and are therefore more likely, physicians 

 say, to report deaths from ill-defined causes as due to tuberculosis than 

 the younger doctors. 



It may be that figure 5 is partly explained by the fact that the 

 southeastern half of the state is largely peopled by the descendants of 



nAP or ' 

 INDIANA 



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 \ 1^ t1-7S(") 



Fig. 9. Death rate from cancer per 100,000 

 population, for the years 1917-20. Data 

 from the reports of the State Board of 

 Health. 



Fig. 10. Changes in population between the 

 census of 1890 and 1920. 



persons who came from Kentucky, Virginia, Carolina and Pennsylvania 

 while the remainder of the state was originally largely settled by per- 

 sons from New York, Ohio, New England and by recent immigrants 

 from northwestern Europe. In the former case, the settlers moved into 

 a somewhat more severe climate, while in the latter case they moved 

 into a milder climate, with more sunshine, and where better dietary 

 conditions prevailed. 



Cancer. — The cancer map (figure 9) shows less regional contrast 

 than prevails in typhoid or tuberculosis, the white counties having an 

 average mortality of 65 and the black 120. Geographic influences are 

 not clearly shown on this map, and some of its features are hard to 



