AS TO SOUNDNESS. 99 



being fairly emptied, keeps the veins overloaded ; and 

 the veins, in holding their liquid load unduly long, and 

 not being relieved of it in time, allow some of its more 

 watery portions to filter through their coats into the 

 surrounding cellular tissue ; the greatest amount escaping, 

 as you might expect, through the parts subject to the 

 greatest pressure, the most dependent parts — the legs. 



If, then, you have filled legs, recollect that the horse 

 has an enfeebled heart, and therefore lessened arterial 

 tension, which shows itself by sweating on exertion and 

 distressed breathing ; and that the horse cannot do the 

 work of a healthy horse without the risk of congested 

 lungs, cardiac asthenia, and death itself. 



We shall resume our subject to-morrow. 



