47G 



DISEASES OF THE SKIN 



namely, upon the forehead, back of the nose, abdomen, and external 

 surface of the hind legs, as gray, gray-yellow or even saffron-yellow, dry, 

 brittle crusts or eschars. These are about the size of the head of a pin 

 in the beginning, but gradually by their growth cover the entire surface, 

 and may finally become from 2 to 5 mm. in thickness. They appear in 

 the shape of round or elliptical scutula, depressed in a saucer-like manner, 

 generally perforated with a dull, lustreless hair, which drops out later on. 

 If the escharous mass is removed we find a corresponding depression 

 with exposed, very red epidermis. As a rule, this is followed by bleeding 

 and more or less itching, and where the disease is extensive, the animal 

 has an odor likened to the urine of cats or old cheese. The claws, 

 when affected, become thickened, loosened, reddened, brittle and are 

 shed. 



Therapeutic Treatment. — The treatment of this disease is easy, 

 consisting of removal of the scutula and a daily application of anti- 





COCQs 



'^F^-; 





Fig. 173. — Trichophyton tonsurans, after treatment with potassium solutions. Enlarged 300 times. 



parasitic agents, especially tincture of iodine, carbolic acid and creosote 

 solution, sublimate or salicylic acid (10 per cent, solution with alcohol), 

 and tar soap. Chloride of sodium (common salt) has recently been 

 advocated in the treatment of ring-worm. It is either to be applied in 

 saturated solution or else made into an ointment with vaseline. 



Concerning the prophylaxis, we refer you to the indications which 

 are given later in herpes. 



2. Herpes Tonsurans. — Debilitating herpes, herpetic ring, herpetic 

 eschar, bare herpes. This fungus, which is said to be the cause of herpes, 

 is called trichophyton tonsurans, and is found in large masses lying on 

 the upper portion of the epidermis, and especially in the hair and its 

 follicle. 



Trichophyton has a much more rapid growth than achorion. It 



