172 DISEASES OF SWINE 



they become so swollen that they burst. It is then that we get the 

 purple or bluish-colored spots, which are permanent and will not 

 disappear on pressure, because the blood is no longer inside the 

 blood-vessels. 



As has already been mentioned, swelling of the eyeUds and 

 snout is quite common in cholera. In some cases this redness and 

 swelling of the eyelids becomes a very marked symptom, and we 

 have, in addition to the sweUing, an inflammation of the inner sur- 

 face of the eyelid, and with this there is a thick yellowish discharge 

 from the eye. This sticky, matter-like substance causes the eye- 

 lids to glue together, and this, with the swelling of the eyelids, makes 

 it impossible for the hog to see. When we consider, in addition 

 to 'this, that the animal is very weak, and especially so in the 

 muscles of the hind Umbs, we are very easily able to understand why 

 it is that the sick hog staggers so when he tries to walk, and often 

 this staggering is accompanied by such a marked degree of blindness 

 that it may very properly be regarded as blind staggers. 



In connection with the swelling of the ears there is often seen 

 formation of small blisters both on the inside and the outside of the 

 ear. When these form the ear is usually very much swollen and 

 may be two or three times its natural thickness. These blisters 

 very often break and we have left in their place a small sore or ulcer. 

 This scabs over, and we may see cases where these scabs run to- 

 gether so as to form one large sore which covers the entire surface 

 of the ear, either on the outer aspect or on the inner surface. It is 

 not the usual thing to find this marked soreness of the ears, but in a 

 very large number of cases we find the ears are very much swollen, 

 thickened, and red in color. 



The swelling and redness of the snout is also commonly found 

 to be quite extensive, and in addition to the redness here we may 

 also have the formation of small blisters and even sores and scab- 

 bing, as in the case of the ears. The very first places for redness and 

 swelling to appear in most cases of hog-cholera are the ears and 

 snout. They should always be looked for in these locations, and 

 then on the under surface of the belly, the inner side of the loins, 

 the flanks, and on the fold of skin between the foreleg and the wall 

 of the chest. 



With the steady progress of the disease the appearance of the 



