124 THE VETERINARY DOCTOR. 
SURFEIT.—PRURIGO. 
Surfeit is an excessive itching with no visible cause, most common 
in colts during breaking, and in horses put to work in warm weather fresh 
from the pasture. It is caused by sudden change from green to dry food, 
too much or too stimulating food, want of work, bad food, and low 
condition. Prurigo is here considered a form of surfeit. 
Symptoms.—Itchiag and rubbing, the hair being thus removed from 
the affected parts; rough, scaly patches, especially at the roots of the tail 
and mane; possibly raw places. The miscroscope can detect no parasites, 
as it can in mange. 
TREATMENT.—Remove the cause, if it be insufficient work, heating 
food, poor or deficient feeding, and make the requisite change. Give the 
horse a good grooming, without brush or comb. Give an occasional sweat. 
For fever, heated skin, great itching in well-fed horses with much blood, 
give belladonna. Arnica is preferable for poor condition and deranged di- 
gestion. Relieve the parts which itch most by applying a liniment com- 
posed of one drachm of carbolic acid and two ounces of glycerine. 
GREASE AND SCRATCHES. 
Grease is an inflammation and ulceration of the skin on the lower 
parts of the legs, with a greasy discharge. Its causes are hereditary weak- 
ness of the skin, mainly in low-bred horses; cold and moisture; sudden 
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