252 



SMALL-POX IN SHEEP. 



is noticed, and each red spot increases in size so as to form 

 a lenticular inflamed papula. About the 8th or 10th day the 

 centre of the papula becomes elevated and transparent. A 

 clear limpid liquid accumulates, and soon becomes turbid. 

 The pustule has a white and then a yellowish opaque appear- 

 ance ; the skin around it is pale. Each pustule is flattened 



Fig. 206. The papular staffs. 



and rarely umbilicated. A certain amount of transudation 

 of lymph occurs, and the pustule then dries, and in a few 

 days a yellowish grey or brown scab is perfectly formed. 

 The scabs fall off, or leave a red depression in the skin. 



