i'.\i;.\ii;i;s' i.xsiii rri;s. 781 



ens, eat clay and eartliy suhstaiices. The lioj; lies about more tbau usual, 

 hiding iu feuee coruers, under litter, and in out of the way places. If he 

 should* have access to a manure pile, that will be a favorite place. During 

 the hottest days he will prefer to lie in the scorching sun rather than in 

 the shade. At first he will respond to calling for feed, but later he will 

 not get up unless urged to do so. During the progress of the disease 

 and sometimes from the very beginning there will be pronounced rheu- 

 matic symptoms. The hog will be lame first in one leg then in another. 

 Tlie back will be arched. Diarrhea usually makes its appearance with 

 the onset and is almost always present at some time during the course. 

 The discharges at first are thinner than normal, but they rapidly become 

 tarry and have a characteristic offensive odor. Constipation may occur 

 and is almost sure to do so in those animals that eat earth. In some of 

 the animals the intestinal contents make casts that perfectly occlude the 

 passage and when struck with a board give the sensation of baked clay. 

 Vomiting is also present. There Is rapid emaciation. The fever is high 

 and the breathing rapid but not labored. 



In the very acute cases, the toxins cause such rapid poisoning of th»> 

 system that death is so sudden that the symptoms may not be devel- 

 oped. A pig that may be eating at the trough at one hour may be dead 

 the next. 



In the chronic type especially lliere is likely to be swelling of the 

 ears and cracking of the tail. Both may drop off. The eruption is more 

 pronounced upon the skin. Ulcers may form from the size of a grain of 

 wheat to the size of the hand. The hair is lost. There is frequently 

 hemorrhage from the nose and sometimes sore mouth and feet. There is 

 coughing as a result of lung involvement. 



In hog cholera the .great fatality is among the pigs, the older hogs 

 often making a recovery or not being attacked. 



In swine plague a cough is probably the first symptom observed. It 

 is paroxysmal at first, but is deep seated. This is more noticeable when 

 the animal first gets up or after exercise. Later the cough is moye per- 

 sistent. The breathing is short and rapid, with little movement to the rib>; 

 and a double jerk in the fianks like a horse with heaves. The breath- 

 ing becomes more labored, the throat swells and there is nose bleed. 

 If the hands are pressed over the ribs there will be evidence of pain, 

 often due to pleurisy. The animal will not move more than necessary, 

 the appetite remains Itetter than in cholera, there is much thirst and 

 much less tendency to diarrhea. Constipation is more frequently pres- 

 ent than in cholera. The eyes are more inflamed and watery, and there 

 is less tendency to skin eruption. Swine plague is particularly liable 

 to attack and be fatal to old hogs. Both diseases may be present in 

 the same herd and even in the same animal at one time, thus compli- 

 cating the symptoms. In nearly all cases where there is doubt and a 

 number of hogs are similarly affected in the same neighborhood it is 



