116 SMALL-POX IN SllKKT 



Nor. 29.— Three years old sheep; Irish l)recd ; 

 ovinated by scratching the epidermis inside each thigh, 

 and making a slight punctnre on the brisket : dry lymph 

 used to the separate places. 



Nor. 30. — Swelling is present, associated with dif- 

 fused redness of the abraded integmnent. No change 

 in the incision. 



Bee. 1. — Small pustules are formed on the scratches. 

 The red colour is declining. 



Dee. 2. — The pustules have discharged their con- 

 tents, the swelling has nearly subsided, and the cuticle 

 is desquamating. The pinicture is marked by the deep 

 red dye of variolous mflammation. 



Dee. 4. — The absorbents surrounding the incision 

 are corded ; the inflamed spot is larger ; but the ani- 

 mal's health is scarcely affected. 



Dec. 6. — A few papulae have appeared. These sub- 

 sequently passed regularly through their several stages, 

 and by the 18th the patient was convalescent. 



It will be seen from the cases related in this chapter, 

 that the ovine vims, after being mserted into the 

 system, remains dormant for a few days, and that if the 

 inoculation takes, a briek-red speck appears around the 

 incision. This gradually increases until it acquires a size 

 about equal to half-a-crown, when it generally ceases to 

 enlarge, and umbilication of its centre and change in its 

 colour come on : circumstances usually attended with 

 more or less constitutional disturbance. At this period 

 the small-pox may, or may not develope itself in the 

 form of an eruption; this probably depends on the 

 susceptibility of the animal to the poison. For we 

 have many opportunities of observing cases in which 

 only local effects follow ovination, yet equal secm-ity 



