DISESASES OF THE NERVOUS SYSTEM 



CONGESTION AND INFLAMMATION OF THE 

 BRAIN 



In congestion and inflammation of the brain in 

 fiogs, both the brain and its coverings are involved 

 in most cases, and for this reason it is unnecessary 

 to attempt any division or classification of these 

 diseases in a work of this kind. 



Causes. — Fat, plethoric hogs are predisposed to 

 this class of disease. The exciting causes are sun- 

 stroke, severe exercise, tumors and parasites press- 

 ing on the nerve tissue, blows on the head, and dia- 

 tetic causes. Certain feeds containing poisonous 

 substances, when eaten in large quantities, may 

 lead to brain disorders.. Eating feeds containing 

 molds and bacterial ferments, or poisons, some- 

 times cause it. The feeding of large quantities of 

 food rich in albumenoids is especially harmful. 



Another cause is unhealthy surroundings, such 

 as poorly ventilated, filthy quarters. Inflammation 

 of the brain may also occur in some infectious diseases. 



Symptoms. — The symptoms usually come on sud- 

 denly. The hog may show symptoms of excitement, 

 irritability, sensitiveness, drowsiness, etc., depending 

 on the general condition of the animal and the di- 

 rect cause of the disturbance. The disease may be 



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