On sewage treatment and disposal : for cities, towns, villages, private dwellings, and public institutions / by Thomas Wardle.

Date:
[1893]
Catalogue details

Licence: Public Domain Mark

Credit: On sewage treatment and disposal : for cities, towns, villages, private dwellings, and public institutions / by Thomas Wardle. Source: Wellcome Collection.

Provider: This material has been provided by the Royal College of Physicians of Edinburgh. The original may be consulted at the Royal College of Physicians of Edinburgh.

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    which might charge me with too great a treatment of bacteri- ology. I do so only because I think the importance of the study of the connection between bacteria and sewage cannot be overrated. Pathogenic Bacteria. One of the most fatal and destructive diseases to which cattle are subjected is— Anthrax {Bacillus anthraces), the bacillus of which is the sole Fio. 26.—Spores of Bacillus anthbacis, X 1200. Stained with gentian-violet, after passing the cover-glass twelve times through the flame. cause of this, is seen in fig. 26. Its spores remain in the soil for a long time after the cattle have died, and consti- tute a serious source of danger. Concerning the Anthrax bacilli, it may be stated that when present in the soi they form an abundant crop of spores, which contaminate grass and spread this direful disease, which speedily infects the blood, kidneys, liver, spleen, skin, lungs, mucous membranes, and capillaries of cattle, causing speedy death. So quickly do they multiply in such nutrient media, that sheep die in a few days, mice and guinea pigs in 48 hours, after subcutaneous injection of these spores. • . T •\ CEdema, or dropsical swelling (Bacillus oedematis mahgm). Death occurs in animals after inoculation in 24 to 48 hours. Fig. 27.