316 The Diseases of Animals 



ily transmitted from one species of animal to another s 

 but under favorable conditions cross -inoculation may 

 occur. 



The disease is recognized by circular patches, varying 

 in diameter from one -half inch to several inches, from 

 which the hair has fallen. These patches usually occur 

 about the head, neck or back. The skin from which 

 the hair has fallen is slightly thickened and scaly. 

 There is some itching of the affected part. 



Painting the diseased area with tincture of iodine 

 once daily for a few days will kill the parasite. Tur- 

 pentine, kerosene, and a solution of one part of carbolic 

 acid in twenty parts of oil are all excellent. The 

 disease is of little significance and yields readily to 

 treatment. 



LICE 



Lice are small wingless insects, of a dull white color, 

 that live upon the surface of the body of many different 

 animals. Each host harbors its own special louse. 

 It is seldom that a species of louse that belongs to a 

 certain species of animal will choose a host of a differ- 

 ent species, but in some cases and under favorable 

 conditions a transfer may occur. Chicken lice will at- 

 tack horses and human beings. Lice are large enough 

 to be seen easily by the naked eye, but they are often 

 difficult to find on the hairy surface of the body, espe- 

 cially when they are few in number and are hidden in 

 the dirt and debris of the skin. The only other para- 

 sites that may be mistaken for lice are the fleas, which 

 are easily distinguished by their jumping habit ; the 



