DISEASES OF SHEEP. 63 



fluence of the weather and temperature, warmth accelera- 

 ting the progress, and cold or wet weather causing delay, . 

 and even in some cases destroying the effect of vaccination 

 more or less. Vaccinated pox, which matures and sup- 

 purates in an extraordinary short time, say in from four to 

 six days, is generally without protective effect, and is there- 

 fore called false pox, this being often the consequence of 

 defective vaccine-matter. In some cases a general eruption 

 of red spots upon the skin is observed : such eruption dis- 

 appears in twenty-four to thirty-six hours, and presents no 

 danger, provided the pox retains its regular form and there 

 is no other incidental disease. 



There is no need of any particular precaution or treat- 

 ment of sheep previous to vaccination ; only be careful not 

 to expose such sheep to Tain or heat, or to excite the circu- 

 lation of the blood before operating. It is therefore most 

 proper to keep the herd quiet in the stable before vaccina- 

 tion, or, if such sheep have to be driven a long distance to 

 the operator, to keep the animals quiet for a day after such 

 drive and before operation. It seems further that the most 

 beneficial result is produced by vaccination when the vac- 

 cine-matter is not allowed to pass through all the blood- 

 vessels of the body ; and therefore it appears again that the 

 ear or tail is the most proper place for vaccination, inas- 

 much as these parts contain the least number of such 

 vessels. 



The treatment of sheep after vaccination is very simple 

 and requires no medical superintendence. On the tenth or 

 eleventh day after vaccination of a herd, each single sheep ' 

 must be examined to detect those whose vaccination has 

 proved ineffectual, and in such cases the operation should 

 be repeated, the lymph or vaccine-matter to be taken from 

 the pox of some other animal of the herd. In case such 

 second vaccination prove of no effect, the animal may be 



