§ Captain Kerbyasked the Minister of Health what study he has made of the papers sent to him by the hon. Member for Arundel and Shoreham concerning the researches of Dr. I. Rapaport, of the University of Wisconsin Institute of Psychiatry; if he is aware that these researches show that the higher the concentration of fluorine in the public water supply, the higher will be the proportion of mongol births; and if he will make a statement.
§ Mr. BraineI know of Dr. Rapaport's work. I am advised that there are fundamental defects in his statistical data which invalidate his findings. A carefully planned investigation carried out in this country has shown that there is no connection between the concen-86W tration of fluoride in the water supply and the incidence of mongolism. I am sending my hon. and gallant Friend a copy of a circular letter on the subject sent by my Chief Medical Officer to medical officers of health.