834 



Fallias- Out of Hair, AYool and Feathers. 



ceptionally continual cold may, in horses, cause falling out of the 

 hair (Hering, Kohlhepp). Wellach observed sudden baldness in 

 young geese. In cage birds falling out of the feathers is often 

 connected with the presence of iVlood-sucking parasites (Der- 

 manyssus) in the neighborhood of the animals. 



Symptoms. Symptomatic alopecia usually affects the 

 whole body, at most the mane, tail and lower parts of the 

 limbs escaping. At first one only has the impression of a more 



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Fig. 119. Alopecia Symptomatica. 



active shedding of the coat, but later the hair coat is very much 

 thinner, and eventually irregular spots become quite hairless; 

 as these rapidly increase in size, the whole of the surface of 

 the body becomes denuded and hairless (Fig. 119). In a por- 

 tion of cases the falling out of the hair is preceded by edema- 

 tous infiltration under the chest, under the belly and at the ex- 

 tremities, or by difficulties of digestion which may, however, ac- 



