THE DISEASES OF CATTLE. 253 



I continue to throw into the cavity, by means of a glass syringe, 

 a small quantity of pryroligneous acid daily, until the discharge 

 ceases. Then the parts are to be di*essed with common tincture 

 of aloes. 



After an operation of this character there will remain some 

 enlargement of the tissual structures about the parts. This can 

 gradually be reduced by a few applications of a portion of the 

 following : — 



Iodide of Potassium, 1 drachm. 



Glycerine, 1 ounce. 



Mix, and keep the preparation in a glass vial, well corked. 



ABSCESS BENEATH THE PERIOSTEUM, AT THE ANGLE 

 OF THE JAW. • 



This is a very frequent and formidable disease among cattle, 

 and is ofttimes occasioned by blows inflicted purposely or acci- 

 dentally on a region known as the angle of the jaw. It is a 

 formidable disease because it frequently ends in caries or ulcer- 

 ation of the jaw bonfe (see page 245). It originates in an 

 inflammatory condition of the periosteum, accompanied by a 

 gradual enlargement at the angle of the jaw. It is very pain- 

 ful, the animal being very unwilling to have the part handled. 



The pain is occasioned by distention of the periosteum, and 

 this is sometimes found to be indurated or thickened. The 

 animal does not eat as well as usual, in consequence of the 

 pain occasioned by the act of mastication, and he generally 

 labors under some degree, more or less severe, of febrile ex- 

 citement. Ordinarily it is a very easy matter to detect the 

 presence of pus in any of the supei-ficial regions ; but in this, 

 located directly on the bone and covered by a fibrous membrane 

 which only admits of a limited amount of distention, it is very 

 diflficult for an unskilful person to discover it ; yet if the above 

 symptoms are observed, I should decide that there is pus be- 

 neath the periosteum. 



Treatment. — No treatment is of any advantage except that 

 of making a free opening through the skin, muscle, and perios- 

 teum, and thus insuring a complete discharge of the morbid 

 22 



