346 DISEASES OF HORSES AND CATTLE. 



each milking, and rub on a little camphorated 

 liniment; continue this for a few weeks. Also 

 give the cow a teaspoonful of sulphate of iron 

 in a mash in the morning and one dram of iodide 

 of potassium in the evening in the drinking water 

 for several weeks. If it is from sores in the teat 

 tubes use ten grains of tannic acid, water one 

 ounce; inject a little of this after each milking. 



Cow-Pox (Variola Vaccine). — This very simple 

 affection is not often noticed, and so many forms of 

 eruption are observed on the teats that it is some- 

 what difficult to detect the true from false varie- 

 ties of cow-pox at certain stages of the eruption. 

 This disease has claimed a very large share of 

 attention on the part of scientific men. From 

 Jenner's discovery in the dairies of Gloucester- 

 shire he observed that the people milking cows 

 with the cow-pox suffered from an eruption on 

 their hands, but never had the malignant small- 

 pox of the human being. This was the origin of 

 vaccination. The cow-pox, like other forms of 

 variola, is a contagious pustular eruption of the 

 skin, running a very regular course, accompanied 

 by slight fever. It is communicable between ani- 

 mals of different species. 



Causes: The primary cause of cow-pox is 

 unknown. The majority of cases occur in 

 spring and summer, shortly after cows have 

 calved. The state of congestion of the ud- 

 der at this period favors the development 

 of this disease, and it never has been ob- 

 served to arise spontaneously in bulls, oxen, or 



