Safe disposal of human excreta at unsewered homes / by L. L. Lumsden, C. W. Stiles, and A. W. Freeman.

  • United States. Public Health Service.
Date:
1915
Catalogue details

Licence: In copyright

Credit: Safe disposal of human excreta at unsewered homes / by L. L. Lumsden, C. W. Stiles, and A. W. Freeman. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

    10/34 (page 8)
    around by various means, of which the following are the most important: By water, through surface washing or subsoil seepage. By the hands or feet of persons or by animals. By flies and other insects. },Yater.—Rain or other water can carry filth into drinking water, either by washing over the ground or by seeping tlirough the ground into a well, spring, stream, or lake (fig. 3). Tubes left by decayed tree-roots and the burrows of insects or of cray-fish or of worms may act as channels to carry the filth considerable distances undergi’ound. L H Fig. 1.—An insanitary privy of primitive type permitting extensive soil pollution. Keprodneed from a photograph. (Original.) Water supplies can become contaminated by excreta conveyed on the hands or feet of persons, on the feet and bodies of poultry and of other animals, and by worms and insects. Water contaminated with human excreta if used for washing certain foods or for washing vessels used for storing or handling foods—milk vessels being particu- larly important in this connection—will spread filth to foods. Thus water can serve both directly and indirectly as an agent in the spread of human excreta—with the various disease germs which such matter may contain—from person to person. Persons and animals.—Persons and animals, such as poultry, dogs, cats, rats, etc., walking over soil polluted with human excreta get