Factors in the Etiology and Arrest of Dental Caries**Work done in collaboration with Oscar M. Schloss, M.D., and. Ludwig Schoenthal, M.D.*From the Department of Pediatrics, Cornell University Medical College, the New York Nursery and Child’s Hospital and the Heckscher Foundation Dental Clinics.*Read before the Section on Mouth Hygiene and Preventive Dentistry at the Seventy-Fourth Annual Session of the American Dental Association, Buffalo, N. Y., Sept. 15, 1932.