Papers on Medicine, Public Health and Sanitation 91 



from pneumonia are four times as numerous as those 

 from influenza. 



A study of the map shows that though Chicago is med- 

 ium in morbidity and medium in mortality the county 

 outside of the city is high in number of cases but low in 

 mortality. The low number of cases in the city may be 

 misleading. It is not impossible that the cases were more 

 fully reported in the surrounding area. However, Ave find 

 a similar condition shown in Alexander County as com- 

 pared mth Cairo, in Macon County as compared with 

 Decatur, in McLean Countj^ as compared with Blooming- 

 ton, in Rock Island County as compared with Rock Is- 

 land, in Tazewell County as compared with Pekin. It 

 is very natural that the inhabitants of the surrounding 

 area should get their infection at their County Seat. 

 Their sickness would be at home and away from the germ 

 laden air of the city. We find in Winnebago County a re- 

 versal of these conditions. The morbidity is higher in 

 Rockford than in the county, according to report, but the 

 mortality is more than ten times greater in the county. 

 This is explained by the fact already mentioned that 

 Canip Grant w^as located in the County outside the limits 

 of the city, and its death rate was very great because it 

 was made up of extremely susceptible material. 



Returning now to the map of the state, attention is 

 called to Calhoun County. This county is a ridge of high 

 ground between the Mississippi and the Illinois Rivers. 

 It is the only county in the State which is not touched by 

 a railroad and it is not even served b}^ an electric line. 

 It contains no large town; the people are very largely 

 farmers. Its isolated position and its rural character 

 would lead one to expect that it would have few cases and 

 that they would be of a mild nature. In fact we found 

 that the cases reported were at the rate of 8,862 per 100,- 

 000, more than double the average for the State. The 

 death rate however Avas 267.1 whereas the average for 

 the State was 396.6. The large number of cases may have 

 been the result of duplication of reports, because the re- 

 porting areas are not clearly defined. The small popula- 

 tion of the county — 8,610 — makes it possible that a very 



