London's Pulse: Medical Officer of Health reports 1848-1972
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Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
London County Council 1899
[Report of the Medical Officer of Health for London County Council]
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DIAGRAM 5.
Showing the number of spores of Anaërobic Bacteria In 1 cc. of Crossness crude sewage
and in 1 cc.of the effluent from the 4 ft., 6 ft. (primary), and 6 ft. (secondary)
coke-beds. [Agar at 37° C].
*The growths spread over the surface of the medium preventing accural a counting.