286 PEINCIPLES OF .VETERINARY SURGERY 



per cent, of alum. Moist heat continuously applied is of 

 advantage, especially in the interstitial inflammations of an 

 acute type. In chronic cases, massage is indicated. Lini- 

 ments and ointments containing camphor, belladonna, tur- 

 pentine, especially iodine and lard (1:20), are largely em- 

 ployed. Lately the inflation of the udder with sterilized 

 air has been recommended. In the treatment of abscesses 

 the knife is required, with subsequent antiseptic injections. 

 In gangrenous, botryomycotic and actinomycotic mammitis, 

 amputation of a quarter or whole udder may become neces- 

 sary. 



DISEASES OP THE SKIN. 



Dermatitis (Inflammation of the Skin). 



What are the causes of dermatitis ? 



It may be of a specific nature, as glanders or tuberculosis; 

 it may be infectious, as pus-producing bacteria ; it may be 

 traumatic, as abrasions, pressure, blows ; it may be thermic, 

 as the heat of the sun, fire heat, steam ; it may be chemical, 

 as caustics, etc. 



How do you classify dermatitis f 



According to its course and extent : acute and chronic, 

 circumscribed and diffused, superficial and deep. 



What forms of dermatitis are of practical interest to the sur- 

 geon 9 



Erythematous dermatitis, suppurative dermatitis, gan- 

 grenous dermatitis, chronic hyperplastic c'ermatitis. 



What do you wndersiand hy erythema f 



Erythematous dermatitis represents a hyperemio state of 

 the skin, mainly involving the papillary layer. 



