Hints from the Health Department. Leaflet from the archive of the Society of Medical Officers of Health. Credit: Wellcome Collection, London
[Report of the Medical Officer of Health for Lambeth Borough]
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BEFORE TREATMENT
Agar plate count per ml. | Coliform count | Escherichia coli count | |||||
---|---|---|---|---|---|---|---|
Source of Supply | Number of Samples | 20-24 hours at 37° C. | 3 days at 37° C. | Per cent. samples negative in 100 ml. | Count per 100 ml. | Per cent, samples negative in 100 ml. | Count per 100 ml. |
Thames-derived South of River1 | — | — | — | — | — | — | — |
Honor Oak | 36 | 0.3 | 51 | 97.22 | — | 100.0 | — |
AFTER TREATMENT
Agar plate count per ml. | Coliform count | E. coli count | |||||
---|---|---|---|---|---|---|---|
Source of Supply | Number of Samples | 20-24 hours at 37° C. | 3 days at 22° C. | Per cent, samples negative in 100 ml. | Percent, samples negative in 100 ml. | ||
Thames-derived South of River* | 1,931 | 10.8 | 99.79 | 100.0 | |||
Honor Oak | 35 | 0.0 | 17 | 100.0 | 100.0 |
* Hampton, Surbiton and Walton