kBPORT O.V DOIRINB. 2$ 



(i\) Circular or oval, with flat aroa in the centre, the circumfer- 

 ence only being raised. 



(v) Irregular forms. Kidney-shaped. Serai-lunar. Trian- 

 gular. Large circular patch surrounded by minute 

 disseminated patches. 



Of 443 plaques observed. in 13 eqnines, 313 were circular and 

 130 oval or irregular in shape. 



Dimensions. In animals which exhibit but few plaques during 

 this stage of the disease each one as it appears is generally fairly 

 large and well-formed. On the other hand, when large numbers 

 make their appearance singly or many at a time and at short 

 intervals, the plaques are usually smaller, although they may con- 

 siderably increase their dimensions within a period of a few days. 

 The circular patches vary from 0*5 to 5 inches in diameter, whereas 

 the oval and irregular-shaped forms were found to vary from a 

 minimum of 0'75 by 0'5 to 8'0 by 5*0 inches. Plaques may appear 

 singly at long intervals or several or many may become visible 

 during a period of 12 to 24 hours. 



A plaque may first appear as a small, round, hard elevation, 

 0*5 inch in diameter, and later develop into a perfectly-formed and 

 circular one of 2'0 inches or more in diameter, or it may appear as a 

 perfectly-shaped plaque and gradually go on increasing in size. 



Sometimes two plaques spread and unite (Alonarc/i Nos. 3 and 

 16), fusing together to form one large plaque. 



An oval patch may, within a few days, increase in size, becomo 

 kidney-shaped (Yadgir No. 38) and again later form a large circular 

 plaque 4 to 5 inches in diameter. 



A plaque may divide into two portions, each of which respectively 

 later forms a perfectly-formed plaque. 



Two small circular plaques situated near to one another may be 

 enveloped by the formation of a third large ore, which occupies an 

 area beyond the limits of the two together (Kilngarth Nos. 9, 10, 

 and 11). 



A plaque may appear on one side of the crest and alter persist- 

 ing for some days suddenly spread and appear on the opposite side 

 of the crest, the two persisting concurrently. 



