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34
Adulterated Samples.
Adulterated samples were reported as follows:—
Formal.
No. 2. Lard—excess of free acid.
Informal.
No. 10. Mint—some plant other than mint.
No. 27. Fruit preserving tablets—10% deficient in sulphur
dioxide.
No. 51. Bread—containing coarse paper or cardboard.
No. 52. Fruit preserving tablets—44% deficient in sulphur
dioxide.
No. 54. Fruit preserving tablets—30% deficient in sulphur
dioxide.
No. 64. Tea—containing an admixture of maize starch.
No. 92. Zinc ointment—0.3% deficient in zinc oxide.
No. 284. Cream of tartar—20 parts per million excess of
lead.
Cautionary letters were sent to the manufacturers in appropriate
cases. The deficiency of sulphur dioxide in the fruit preserving tablets
was due to storage, and existing stocks were consequently withdrawn.
Heat Treated Milk.
Samples of pasteurised and sterilised milk are taken at regular
intervals for submission to the Public Health Laboratory Service for
the prescribed tests, and during the year samples as under were taken
with the results set out: Phosphatase Methylene Blue
Satisfactory Failed Satisfactory Failed
Pasteurised 37 – 37 –
Turbidity
Satisfactory Failed
Sterilised 32 –
Monthly returns of the samples taken, and of the results of the
examinations, are sent to the Milk Division of the Ministry of
Agriculture, Fisheries and Food, and they are at once notified of
any adverse report.
Milk supplied in Schools and Hospitals.
Samples of milk in course of delivery to Schools and Hospitals
in the Borough are taken, both for chemical analysis and for submission
to the prescribed tests for such milk. The samples are included
in the general totals given on pages 31,32 and 34. The results of the
analyses and tests are communicated to the London County Council
or to the appropriate Hospital Management Committee.
Ice-Cream.
Forty-eight samples of ice-cream were taken during the year, each
sample beine submitted to the methylene blue test.