In presenting this group of cases of oral lesions my primary intention is to give a statistical incidence of diseases and lesions that involve the oral cavity to fill in a hiatus in medical literature. In a compilation of the various groups, some comment is indicated to clarify the various conditions involving specific locations in the mouth and to dilate on some of the specialdiseases and some of the more recent theories accounting for oral disease. The oral cavity has always been a "no man's land" as far as any group of physicians or dentists can claim a special knowledge of the multitude of lesions found in this domain. As the mouth reflects in many instances disease processes elsewhere in the body, it can well be considered the "diagnostic mirror" of the body. No group of medical specialists is better fitted by training to lead the way in stimulating