CHAPTER V. 

 DISEASES OF THE HEART. 



Frequency in different animals. General symptoms. Palpitation, tliiimpa 

 Displacement of the heart. Cyanosis. Enlargement, hypertrophy. Wast 

 mg, atrophy. Dilatation. Pericarditis, inflammation of the heart-sac. En- 

 docarditis, inflammation of the lining membrane of the heart. Carditis, in- 

 flammation of the structure of the heart. Chronic disease of the valves. 

 Fatty degeneration of the heart. Tumors and parasites of the heart. Rupt- 

 are of the heart. 



These are much more common in domestic animals than 

 is generally supposed. Though protected in animals from 

 the strain consequent on the upright position of man and 

 excessive mental efforts, the heart suffers from the severe 

 physical exertions of dogs and horses and in all animals 

 from its contiguity to diseased lungs and pleurae, from the 

 increased force necessary to propel the blood through the 

 lungs or general circulation when disease offers mechan- 

 ical obstructions, and above all from the settling of rheu- 

 matism on its valves and other fibrous textures. Dairy 

 covins suffer greatly from pins, needles and other sharp- 

 pointed bodies swallowed with the food and afterward di- 

 rected toward the heart by its movements. High-bred 

 oxen, sheep, pigs and even pampered horses are very sub- 

 ject to fatty degeneration of the muscular substance of the 

 heart and consequent dilatation of its cavities. 



GENEEAL SYMPTOMS OF HEART-DISEASE. 



1. The pulse in full grown animals at rest may be set 

 lown as follows per minute : — horse 36 to 46 ; ox 38 to 42. 

 )r in a hot building or with full paunch, 70 ; sheep, goat 



