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The exhibit of the Illinois State Board of Health in the Section of Hygiene in the Columbian Exposition, consisted of eleven maps and twenty diagrams, showing a graphic presentation of the relations between locality, population, water supply,sewerage,etc., with reference tothe prevalence and causation not only of typhoid fever, but the zymotic or preventable diseases generally. They are the results of an investigation into the epidemic of typhoid fever of 1891, and include the years 1890, 1891 and 1882. There are six mortality maps, and on the margins are explanatory notes, with the death rates per 1,000 of typhoid fever and other zymotic diseases. Map No. 7 is a population map, and on it is presented the influence of density upon life, and to a great extent the conditions under which people live. Map No. 8 illustrates the water supply system of Chicago and the points in Lake Michigan at which
EXHIBIT OF THE ILLINOIS STATE BOARD OF HEALTH. JAMA. 1893;XXI(19):702. doi:10.1001/jama.1893.02420710030012
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