CHAPTEE VII. 

 DISEASES OF THE HEAET. 



Frequency in different animals. General symptoms. Palpitation, thumps, 

 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 pleurse, 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 

 cows 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. 



GEKERAI/ SYMPTOMS OF HEAET-DISEASE. 



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

 Town as follows per minute : — horse 36 to 46 ; ox 38 to 42, 

 ir in a hot biiilding or with full paunch, 70 ; sheep, goat 



