316 The Diseases of Animals 
uy transmitted from one species of animal to another, 
but under favorable conditions eross-inoculation may 
oecur. 
The disease is recognized by circular patches, varying 
in diameter from one-half inch to several inches, from 
whieh the hair has fallen. These patches usually occur 
about the head, neck or back. The skin from whieh 
the hair has fallen is slightly thickened and sealy. 
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- 
rentine, 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 oeeur. 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 
