DISEASES OF HORSES AND CATTLE. 349 



few distinguished between the equine and the 

 grease, a recurrent disease (eczema impitigonoe- 

 des),as it appears to me for many years past. How- 

 ever, the spontaneous origin of the variola vaccine 

 in cows has not been doubted here. In all the 

 cases that I have noticed I never could discover the 

 probability of any other source. There is much 

 difficulty in determining with precision at all 

 times whether the disease arises primarily in one 

 or more individuals in the same dairy. Most com- 

 monly, however, it appears to be solitary. The 

 milkers pretend in general to point out the in- 

 fected individual, but as I have more than once 

 detected the disease in a late stage on an animal 

 not suspected of having it, I am not very prone to 

 confide in these representations unless my own 

 inspection confirms or renders them probable. 



Symptoms: There are general signs of mild 

 fever, and the characteristic symptoms are purely 

 local. Constitutional symptoms have been de- 

 scribed in some cases as follows: Sudden sinking 

 or loss of milk, dribbling of saliva from the mouth 

 and frequent inflation and retraction of the cheeks, 

 staring coat, arched back, limbs drawn together, 

 and rapid loss of flesh. In about three or four days 

 red, hard spots are seen, which soon appear cir- 

 cumscribed, the teats become painful and slightly 

 swollen, the spots attain the size of a horse bean, 

 and milking becomes generally very painful to the 

 animal. They rapidly increase in size and tender- 

 ness and become charged with limpid fluid and 

 are surrounded by a red base. The limpid fluid be- 



