. Les bactéries, levures et moisissures dans la maison. Bactériologie, levures, moisissures (champignons). Les BACTÉRIES DANS LE SOL I3S provenant directement de l'eau des ruisseaux et des rivières est plus susceptible de contenir ces organismes en plus grand nombre. L'eau potable plus dangereux pour des fins, c'est que des rivières qui ont été contaminés par les eaux usées, une condition de choses vrai de l'eau utilisée dans certaines villes. Le sol. Sol sur la surface de la terre est généralement remplie de bactéries (Fig. 56). Ils sont généralement abondants dans les couches superficielles, accusant une^ 6 rapidement que nous passons en dessous de la sur

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. Bacteria, yeasts and molds in the home. Bacteriology; Yeast fungi; Molds (Fungi). BACTERIA IN THE SOIL I3S water derived directly from flowing streams and rivers is most likely to contain these organisms in greatest num- bers. The most dangerous water for drinking pur- poses is that of rivers which have been contaminated in any way by sewage material, a condition of things true of the water used in some cities. Soil. Soil on the surface of the earth is usually filled with bacteria (Fig. 56). They are usually abundant in the superficial layers, decreasing a^ 6 rapidly as we pass below the sur- face, until at the depth of a com- paratively few feet they practi- cally disappear. They are more abundant in some kinds of soil than in others. Where the soil is dry and sandy the number is comparatively small; where it is moist and loamy they are more abundant. They are found pro- fusely around buried bodies of animals, or in soil that contains decaying roots of ordinary plants. They are immensely numerous in the* vicinity of earth closets or privies, and the soil near sink drains and manure heaps is filled with them. Indeed, any soil which contains the remains of animal or vegetable matter and a considerable amount of moisture will have bacteria in inconceivable num- bers, while in cleaner soils they will be much less abundant. They' are sure to be abundant in all dirt which accu- mulates in a household, for nearly all such dirt contains. Fig. 56. Soil organisms. Bacillus subtilis; b^ B. cereus; t', B. megatherutm; d^ Pseudo- monas fiuorescens ; ^, nitrate or- ganism ; /, nitrite organism; g, Azotobacter; A, an Actinomyces. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Conn, H. W. (Herbert William), b. 1859. Boston, New York, Ginn and Company

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• bookcentury1900
• bookdecade1910
• booksubjectbacteri
• bookyear1917