SIR,—If Mr. Clark reads appendices 2, 3 and 4 of
the Ministry's report published in 1962 as 'The Conduct of Fluoridation Studies, etc.,' he should have his mind set at rest about the method of dosing and testing. But the real answer to his difficulties lies in the twenty-one years of experience of artificial fluori- dation in North America, the ten years in this country and the various periods in the rest of the world during which nothing has gone wrong.
Studies of areas where the natural fluoride greatly exceeds the one part per million recommended show that for this mineral to have any effect at all it must be ingested over a long period of years. It would seem therefore that if Mr. Clark's friend with the bucket was careless enough to put in too much one evening it would have no effect on the consumers but would show up in the tests.
A. G. F. FARQUHAR Pradanack Morva, Mullion, Helston, Cornwall
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