SKIX DISEASES. 171 



essary. Wash and disinfect with carbolic or corrosive sub- 

 limate solution clothing, harness, stable fittings, rubbing 

 posts, &c. 



Fig. 49. The mite or acarus known as Sarcoptes Equi. Magnified. 



RINGWORM OR TETTER (Proper), 



' Is caused by vegetable parasites (gnawing worms), which 

 implant themselves in the hair follicles (secreting cells). 

 Dampness, darkness, and improper diet favor their pro- 

 duction. Young horses suffer most. The more or less 

 circular patches are clear gray and shining. The hair 

 falls out, disclosing either minute eruptions or distinct 

 and separable scales. Some patches have healthy spots in 

 the center, but it sometimes seems to cure itself through 

 the death of the parasites. 



Ringworm, Yellow or Honeycomb, is also caused 

 by parasites, which may be transplanted to other animals. 

 The patches consist of cup-shaped, yellowish scabs or 

 crusts, sometimes separate, at others confluent. The odor 



