RARE DISEASES OF THE HEART. 131 



and also the pericardium ; adventitious growths in connec- 

 tion with the heart, such as parasitic and malignant, fibroid 

 and vascular tumors ; disease of the valves and orifices ; 

 ossification (rare); air in the heart; enlargement of the. 

 aorta. 



The symptoms of most of these affections — many of 

 which are rare — are puzzling even to veterinarians. 



Where heart disease is suspected, avoid overwork and 

 excitement. 



