THE 



Ohio Journal of Science 



I'lTil.ISHKD BY THE 



Ohio State University Scientific Society 

 Volume XVIII NOVEMBER, 1917 No. 1 



TABLE OF CONTENTS 



FoRRMAN AND Rekd— Tumors ill Dogs. II 1 



WAi/roN — The Axial Rotation of Aquatic Microorgonisins and its Significance (> 



Napper — Concretionary Fonns in the Greenfiekl Limestone 7 



Rice— Report of the Twenty-seventh Annual ■Meeting of the Ohio Academy 



of Science 14 



TUMORS IN DOGS. 



II. A Fibro-blastoma of the Alveolar Border of the Jaw 

 Contaming Giant Cells, (a. Giant Cell Epulis). 



By Jonathan Forman and Carlos L Reed. 

 (From the Laboratories of Pathology and Physiology of the Ohio State University) 



According to Wolff, ('13) the dog is more frequently 

 afflicted with sarcoma than any other lower animal. Frohner 

 observes that sarcomas in the dog occur most often in the 

 subcutaneous tissues. This author also mentions "Epulis 

 sarkomatosa" as presenting itself frequently on the upper jaw 

 of dogs and less frequently on the lower jaw. The specimen 

 described here is not presented because of the rariety of the type, 

 but because it apparently throws some light on the nature of the 

 giant cells frequently seen in epulides. 



Epulis is a topographical term signifying any growth upon 

 the gums. Used in this broad sense, it may cover tumors of 

 bone, connective tissue, epithelium, inflammatory conditions, 

 and simple hypertrophies of the gums such as are occasionally 

 encountered in pregnancy. The term, however, has become 

 restricted to those tumors which are seated upon the gum 

 or the upper edge of the alveolar border and which are of 

 mesenchymal origin. In man three types have been described; 



