740 DISEASES OF THE SKIN. 



Favus is a disease rarely seen in the clog; it is the result of a parasite 

 which penetrates deeply; the hairs then becoming brittle , lose their lustre 

 and finally fall out. Itching is not a symptom, the eruption being attended 

 with pain. Damp kennels and general neglect favor this affection as they 

 do other parasitic diseases of a similar nature. 



Treatment. — The crusts should first be soaked with oil or lard, then 

 removed, and the hair shaved. Many local remedies have been advised ; 

 among them the oleate of copper promises especially well. The sulphuret 

 of potassium is an agent of great value in parasitic diseases, and if the 

 eruption is not extensive may be applied in the following compound. — 

 R Potassii Sulphureti 3 i 

 Sapo. Viridis £ss 



Adepis § iss 



Ft. Ungt. Sig. Apply three times daily. 

 Where the disease is extensive, the quantity of potassium should be les- 

 sened one half or one fourth as it appears judicious. 



The solution of carbolic acid and Canada balsam advised in follicular 

 mange, will prove as destructive in favus as in that disease, and if used, 

 the same caution is to be observed. The hair will be renewed excepting 

 where the crusts have persisted too long, and by pressure on the skin 

 induced ulceration, which in healing has left a scar. 



(Ringworm. 



This affection is occasionally met with in canine practice. It is due to a 

 parasite identical with that in favus, and is the exciting element in both 

 diseases. The same influences are active in propagating all forms of vege- 

 table parasites or fungi ; warmth and moisture favor them, and thus damp 

 kennels, unclean bedding, and general neglect are predisposing causes. 



Ringworm is very easily communicated by contact ; animals may trans- 

 mit the affection to man or by turn be infected. The disease manifests it- 

 self in round patches which are covered with thin scales or crusts easily 

 detached. It spreads quite uniformly, enlarging its circle on the outer 

 edge of which the eruption is more prominent, receding as it were from 

 the centre. The hair becomes dry and harsh, losing its elasticity and 

 breaks off or falls out. 



Ringworm may appear in the form of small pointed vesicles, containing 

 a clear fluid, and arranged in a circular form; or it may take the form of 

 pale, red spots, having a small whitish scale in their centre. 



2'reatment. — The destruction of the parasite which excites the disease 

 ought not be difficult. The hair should be shaved sufficiently beyond the 



