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 London, City of ]
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Bacteriological Analysis of Samples of Soda Water During October-November, 1910
No. of Sample. | No. of Microbes per 1 c.c. | Presence of B. coli in 10 c.c. | Presence of b. coli in 1 c.c. | Result. |
---|---|---|---|---|
1 | Eight | Negative | Negative | Pure. |
2 | Uncountable | Positive | Positive | Impure. |
3 | Less than ten | Negative | Negative | Pure. |
4 | Very few | Negative | Negative | Pure. |
5 | Several hundred | Positive | Positive | Impure. |
6 | Innumerable | Positive | Positive | Impure. |
7 | One | Negative | Negative | Pure |
8 | Three | Negative | Negative | Pure |
9 | Over 300 | ? | Negative | Pure |
10 | Ten | Negative | Negative | Pure |
11 | None | Negative | Negative | Pure |
12 | None | Negative | Negative | Pure |
13 | None | Negative | Negative | Pure |
14 | Two | Negative | Negative | Pure |
15 | Few air borne | Negative | Negative | Pure |
16 | None | Negative | Negative | Pure |
17 | None | Negative | Negative | Pure |
18 | None | Negative | Negative | Pure |
19 | One | ? | Negative | Fairly Pure |
20 | None | Negative | Negative | Pure |
21 | 48 | Negative | Negative | Fairly Pure. |
22 | 115 | Positive | Negative | Impure. |
23 | None | Negative | Negative | Pure. |
24 | None | Negative | Negative | Pure. |
25 | Few | Negative | Negative | Pure. |
26 | None | Negative | Negative | Pure. |
27 | None | Negative | Negative | Pure. |
28 | None | Negative | Negative | Pure. |
29 | None | Negative | Negative | Pure. |
Column 2 gives the number of Microbes per 1 c.c., capable of growing at body temperature.
Column 3 gives the presence of B. coli, capable of fermenting glucose, per 10 c.c.
Column 4 gives the presence of B. coli, capable of fermenting lactose, per 1 c.c.
From this analysis it follows that, of the 36 samples, 32 may be considered as pure, that is,
nearly 90 (88.) percentage are good, only 4 samples, or 12 per cent., are impure; and further,
that more than 58 per cent. of the samples were quite pure, and showing hardly any or no
. bacteria in 1 c.c.
Summary of Results, 1910. as Compared with 1907.
No. of Samples. No. of Samples.
Pure 30 or 83.3 per cent. Pure 10 or 27.7 per cent.
Fairly pure 2 or 5.5 per cent. Fairly pure 7 or 19.4 per cent.
Impure 4 or 11.1 per cent. Impure 19 or 52.7 per cent.
These results are a source of encouragement and congratulation, and show,
at any rate, that some serious sources of trouble have been abolished.
With regard to those manufacturers whose goods have been proved to
be impure, they have each received a cautionary letter, and further samples of
their products will be taken at a later date, when, in the event of their being
again declared unfit for food, the matter will be placed in the hands of the City
Solicitor to take such action as he may deem necessary.
Although the periodical inspection of the premises, for which purpose the
Inspector I have referred to was to be appointed, has never been put into
operation, the practical results obtained in order to qualify for registration
remain, and the result of Dr. Klein's analysis can only lead to the conclusion
that such have been responsible for the improvement in the wholesomeness of
the Soda Water as sold to the public.
These results have been obtained under a system of voluntary registration,
but, bearing in mind the large extent to which soda water is consumed,
especially by invalids, it does not seem too much to insist that what has been