Within the past year it has been my privilege to study, clinically and histologically, a considerable variety of mesoblastic neoplasms of the oral cavity. Most of these cases occurred in the oral surgical service of Dr. M. H. Cryer, to whom I am indebted for the opportunity of reporting them.
Most of the growths under consideration fall into that group known under the common term "epulis," a name meaning from its derivation anything on the gum. An epulis may be described as a circumscribed connective-tissue growth from the alveolar ridge, which is covered over by the normal mucous membrane, except as the latter may undergo secondary ulceration due to pressure necrosis, infection, etc. (Occasionally, growths clinically classified as epulis may be found to be epithelial in nature, for example, papilloma, epithelioma, etc., but these will not be considered here.) Under this broad heading, therefore, many clinical and pathologic varieties o