CHAPTER XIII 



DISEASES AFFECTING THE BRttlN AND 

 NERVOUS SYSTEM 



As compared with man, domestic animals are affected 

 by few diseases of the nervous sj'stem. This is prob- 

 ably due, in part, to the higher development of the 

 nervous system in man, as well as to the greater strain 

 to which it is subjected. Insanity and the other men- 

 tal diseases in man that may be caused by worry and 

 excesses, are practically unknown among animals. 

 Some of the so-called "nervous diseases" are merely 

 symptoms of other disorders; but, inasmuch as the 

 farmer recognizes symptoms as diseases, it has seemed 

 best to include in one chapter the common diseases 

 that manifest themselves chiefly in the nervous system. 



HYDROCEPHALUS 



Hydrocephalus, commonly called "water on the brain," 

 sometimes occurs in foals, calves and other young ani- 

 mals at birth. The skull is enlarged and the brain is 

 largely replaced by a watery fluid. See Fig. 41, Chapter 

 IX. Animals affected with this disease seldom live, and 

 when they do are of no value. The best plan is to 

 destroy them at once, as there is no treatment known 

 that is satisfactory. 



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