Mottled Teeth: An Experimental and Histologic Analysis**Read at the Midwinter Clinic of the Chicago Dental Society, Feb. 27, 1934.From the Department of Histology, College of Dentistry, University of Illinois, and the Department of Nutrition, College of Agriculture, University of Arizona.This report is in part a condensed presentation of an investigation on fluorosis published in full by the University of Arizona: Schour, Isaac, and Smith, M. C.: Histologic Changes in Enamel and Dentin of Rat Incisor in Acute and Chronic Experimental Fluorosis, Technical Bull. No. 52; June 15, 1934, University of Arizona, Agricultural Experiment Station, Tucson, Ariz.