community than to make rich and poor alike conscious of nuisances that are being committed against themselves and their neighbors. The rich are able to run away from nuisances that they cannot have abated. If proper publicity is given to living conditions among those who do not resist nuisances, the presence of such conditions will itself become offensive to the well-to-do, who will take steps to remove the nuisance. Jacob Riis in this way made the slums a nuisance to rich residents in New York City and stimulated tenement reform, building of parks, etc. _Anti-slum_ motives originated in cities where there is a clear dividing line between the clean and the unclean, the infected and the uninfected, the orderly and the disorderly, high and low vitality. As soon as one district becomes definitely known as a source of nuisance, infection, and disease, better situated districts begin to make laws to protect themselves. A great part of our existing health codes and a very large part of the funds spent on health administration are designed to protect those of high income against disease incident to those of low income, high vitality against low vitality, houses with rooms to spare against houses that are overcrowded. To the small town and the country the slum means generally the near-by city whose papers talk of epidemic scarlet fever, diphtheria, or smallpox. Cities have only recently begun to experience anti-slum aversion to country dairies whose uncleanliness brings infected milk to city babies, or to filthy factories and farms that pollute water reservoirs and cause typhoid. The last serious smallpox epidemic in the East came from the South by way of rural districts that failed to notify the Pennsylvania state board of health of the outbreak until the disease was scattered broadcast. Every individual knows of some family or some district that is immediately pictured when terms like "disease," "epidemic," "slum," are pronounced. The steps worked out by the anti-slum motive to protect "those who have" from disease arising from "those who have not" are given on page 31. [Illustration: A COUNTRY MENACE TO CITY HEALTH]