28 



VETERINAKY MEDICINE AND SURGERY. 



has been opened with good effect, and the wound in the skin closed by 

 means of a pin, retained in its position by a small quantity of tow or 

 thread. If the haemorrhage is not arrested by this method in the case 

 of arteriotomy, a pin or needle can be placed underneath the artery 

 Fig. 18, as in acupressure. In this way it will be most effectually arrested, 

 at the cost, however, of the vessel, which will become obliterated at that 

 spot. But this is of little consequence, as the collateral circulation will 

 be sufficient to maintain the integrity of the part. 



Local blood-letting is performed upon the inflamed part, or as near 

 to it as possible, and the object is speedily to unload the engorged blood- 

 vessels. It may be done by scarification, incision, or puncture. In con- 

 junctivitis, for example, it may be drawn from the vessels of the inflamed 

 part by scarifying the inner surface of the eyelids, or by opening the 

 angular vein. In inflammatory disease of the foot, any quantitv can be 

 obtained by puncturing the coronary plexus of veins. 



When general blood-letting from the jugular is practised, the animal's 



Fig. 19. 



Fig. 20. 

 Two forms of seton needles 



head should be elevated and a full stream of blood allowed to flow from 

 a sufficiently large orifice in the vein. If this be done, a smaller amount 

 of blood drawn will make a much greater impression on the pulse than 

 when the orifice in the vein is small, the blood flowing in a trickling 

 stream, and the head depressed. 



Setons are usually introduced by means of needles made specially 

 for the purpose, Figs. 19 and 20, although in some places a seton may 



