Parasitic Diseases of the Skin. 



245 



of powder, and emits a smell of mice. It is rare among 

 horses. 



Treatment. — Iodine ointment applied several times 

 usually effects a cure. 



The disease is common among mice, from whom cats 

 receive it and convey it to horses. 



Tinea Tonsurans ; True Ringworm. — This is the 

 familiar form of parasitic fungus among horses. It is 

 also a disease of the hair bulbs and follicles. A circular 

 patch is formed, which 

 by enlargement invades 

 a wider extent of sur- 

 face. The hair on the 

 edge of the patch breaks 

 off short, and a crust of 

 fungus is formed, which 

 ultimately breaks down 

 in a bran powder. There 

 are no vesicles as in 

 Heroes circinatus — false 

 ringworm, which, on the 

 other hand, has no scurf 

 or scales. The fungus 

 of true ringworm may 



be transferred to mankind and the ox tribe by contagion. 

 The face, neck, back, and quarters are the parts most 

 affected in horses. 



Treatment. — Soften the crusts by means of lard, gly- 

 cerine, or warm water, when they may be removed. The 

 remedy afterwards is one of the following : — Iodine oint- 

 ment, the mineral acids diluted, perchloride of iron, &c. 

 " Sanitas " oil as a disinfectant should be used for 

 cleansing the clothing, harness, and building, and may 

 be applied to the diseased patches alternately with the 

 above-named remedies. 



Herpes Tonsurans, or True Ringworm, 



