106 DISEASES OF HORSES AND CATTLE. 



should remain on for three days; then it can be re- 

 moved and the wound dressed. 



Aneurism is a tumor formed by coagulated ar- 

 terial blood within a dilated artery, or between the 

 several coats of such a vessel, or externally to it. 

 Aneurisms may form in any of the arteries, but 

 the superficial ones are usually found in the neck 

 and legs. They are soft tumors, which appear in 

 the course of the artery and pulsate at the same 

 time as the heart beats. On applying the ear to 

 the- tumor a peculiar sound will be heard resem- 

 bling hissing. If it is considered advisable to treat 

 it, it is best done-by dissecting out the tumor and 

 applying a ligature to the artery above and below. 

 Then cut off the tumor, but if it is not interfering 

 with the animaPs usefulness, it is best to let it 

 alone. 



Venous Hemorrhage. — An animal can lose much 

 more blood from a vein without any danger to its 

 life than from an artery, as the blood runs more 

 slowly, and it has given up its nourishment to the 

 tissues before it reaches the vein. The hemorrhage 

 from a vein should be stopped by pressure or by pin- 

 ning up the wound, as it is a bad and dangerous 

 practice to tie a large vein, as they are made up 

 from the union of a number of small veins, and if 

 the trunk vein is tied, the small ones have no place 

 to empty themselves, and the result would be stag- 

 nation of the vessels covering a large surface. Not 

 so with the arteries. The blood is flowing from the 

 large vessel to the small ones; and if the large one 

 is tied, the collaterals will become enlarged, and 



