62 DISEASES OP SHEEP. 



then of a scarlet-red color, glosay, very painful, hot, and 

 enclosed by a red circle ; its diameter being generally from 

 one inch to an inch and a half. From the eleventh to the 

 thirteenth day the color of the pox fades, the elevation of 

 the pox increasing ; at the same time the clear and watery 

 lymph settles around the edge of the pox, so that on the 

 thirteenth day the greatest amount of lymph is formed. 

 After this time the lymph changes into a thick and sup- 

 purated slime, the pox shrinks and changes into a dark- 

 brown scurf, which after twenty or thirty days drops off, 

 leaving a scar often of a large size. Such, is mostly the 

 case with tail pox, the incidents of ear pox being some- 

 what different, namely : there is less intensity of redness, 

 the size of the pox being that of a pea, the skin extending 

 and elevating largely, containing a larger amount of lymph, 

 which latter produces so much more vaccine-matter ; the 

 natural pox having the appearance of a well-filled bladder 

 or bubble, the scurf being of less thickness and dropping 

 off easily. The entire ear appears to be swollen often to an 

 inch in thickness. There are numerous deviations from the 

 regular progress of vaccinated pox above described ; some 

 of these deviations are unimportant; others, however, are 

 more or less critical. It often happens, especially with ear 

 vaccination, that so-called side pox arise in the neighbor- 

 hood of the vaccinated spot. If such side pox are of a 

 regular form and progress, and not too numerous, there is 

 no danger ; there are, however, cases of vaccination in 

 which a general pox disease may arise, which produces the • 

 same appearance and danger as the malignant natural pox. 

 But such cases occur very seldom, and are nearly always 

 the consequence of bad management. Another deviation 

 from the regular course of vaccinated pox consists in the 

 difference of time required for the formation and maturity 

 of the pustules, such difference being occasioned by the in- 



