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56
pumped from four wells which have a fluoride content of
between 0 4 and 1.9 parts per million. The higher figure
is well inside the range where a dental influence would
be expected. However, before piping to the domestic
supply this well water is mixed with other water from
outside sources. The water company were unable to give us
any exact data of fluorine analysis of the final tap
water.
As far as dental caries is concerned analysis of data
obtained from two schools in Northolt did not show any
significant difference from the general pattern in the
Borough but the Northolt population is largely new and
any effect could only be visible after several years
among children who had lived there most of their lives.
It was decided to seek the help of Miss J.R. Forrest,
L.D. S., of the Ministry of Health in securing a series of
analyses of the domestic water supplies in Northolt.
Miss Forrest kindly arranged for this to be done by the
Government Chemist and it was found that the fluoride
content was 0.30 parts per million with very little variation.
As a level of 1.0 part per million needs to be
maintained for caries to be reduced it can be appreciated
that the water supply in Northolt is unlikely to produce
a beneficial effect.

EAR, NOSE AND THROAT SERVICE.
Mr. Savege, Consulting Otologist, reports:-
It is interesting to note that the character of cases
referred from School Medical Inspections and from General
Practitioners to the School E.N. T. Clinics has changed
over the years.