(Physicians will confer a favor by sending for this department items of news of more or less general interest: such as relate to society activities, new hospitals, education, public health, etc.)
Fluorine Content of Drinking Water.
—At least fortyfive communities where mottled enamel of the teeth is endemic have been revealed as the result of investigations carried on in the past year throughout the state. About 110 public and 55 private water supplies have been analyzed. Practically every community in the state with a population large enough to warrant investigation was visited, and the occurrence or absence of mottled enamel was recorded. Examination was made of the permanent teeth of school children, and the water supply was sampled at the time of the examination. The majority of the communities in which mottled enamel was found lie along two rivers, the Gila and the San Pedro. In the summer of