A Preliminary Study of Gross Maxillary and Dental Defects in Three Hundred Rats on Defective and Deficient Diet11A part of this paper was prepared in the Hunterian Laboratory, Department of Pediatrics, Johns Hopkins University, in conjunction with Drs. E. V. McCollum and Nina Simmonds and E. N. Kinney of the laboratories of the Department of Chemical Hygiene and Public Health, Johns Hopkins University; it is appearing in the Johns Hopkins Bulletin, entitled, “The Relation of Nutrition to Tooth Development and Tooth Preservation — A Preliminary Study of Gross Maxillary and Dental Defects in Two Hunderd and Twenty Rats on Defective and Deficient Diets.”