2 The Ohio Journal of Science [Vol. XVIII, No. 1, 



first, the fibrous epulis; second, the giant cell epulis; and third, 

 the endothelial variety described by Whitman ('14) and Ivy 

 ('15). The term epulis, however, seems to us to be a poor one 

 and we would prefer to see it replaced by the correct name of 

 whatever type of tumor it happens to be. 



The so-called giant cell sarcoma or epulis of the jaw has been 

 the subject of controversy. Some authorities claiming that 

 it is a benign growth while others believe it to be malignant. 

 Several causes have led to this confusion: first, the use of the 

 term epulis, which does not define the type of growth; second, 



Fig. 1. A Photograph of the Tumor. 



too much importance has been attached to the presence of 

 giant cells but without due attention to their nature; third, 

 the giant cell fibro-sarcoma may have been confused with the 

 endothelial variety described by Whitman ('14). 



The tumor upon which this paper is based occurred upon 

 the upper jaw of a dog which came into the Laboratory of 

 Physiology during the school year 1915-16. The dog was an 

 adult mongrel shepherd whose age was unknown. The accom- 

 panying figure gives an adequate idea of the size and location 



