§ Mr. Viantasked the Minister of Health the results established by recent work in the United States of America confirmed by the results of his pilot study into the fluorine content of the urine of adults in connection with the fluoridation of water supplies; and what are the names of the authors and the dates and places of publication of these researches.
§ Mr. Iain MacleodThe results show that it is safe to add one part per million and that it is more practicable to decide the level of fluoridation in the light of dental surveys rather than by urinary examinations. References to all the relevant American work will be found in a recent publication of the American Association for the Advancement of Science, called "Fluoridation as a public health measure," which is published in Washington and can be obtained in London.