Mrs. Butlerasked the Minister of Housing and Local Government and Minister far Welsh Affairs from what source sodium fluoride was obtained for addition to the water supply in the experimental schemes conducted in this country; and what sources will be available to local health authorities intending to add sodium fluoride to their water supplies.
§ Mr. CorfieldSodium fluoride was obtained for the study areas through normal commercial channels. There is no reason to suppose that ample supplies of this substance, of a suitable grade, will not be available for general use.