DISEASES OP CATTLE. 11 



nflamed and full of milk, the diet should be scanty, ai 

 he cow should be frequently milked with care. 



We have seen that the cow pox is not only of no impo 

 mce in an economical point of view, since it involves 

 secuniary loss, but it is of incalculable benefit to the humi 

 •ace. Millions of the present generation are indebted to 

 br their lives, and for the fact that their faces are not d 

 igured by the small pox. Doctor Edward Jenner, 

 English physician, in 1775, made the invaluable discove 

 rhat persons who had an eruption on their hands, caus 

 iccidentally by milking cows affected with the pox, d 

 lot get the small pox. This led him to try several expe 

 nents. He innoculated the virus or poison of the smi 

 Dox into persons who had had the cow pox, and failed 

 jroducing the disease. This led him to suppose that su 

 persons were no longer susceptible to small pox, and 1 

 supposition was strikingly confirmed. He selected sevej 

 Dersons and vaccinated them with the lymph of the ci 

 30X, and the cow pox was in all cases developed in the 

 without the appearance of other symptoms of disea 

 Ee afterward vaccinated the same persons with the lym 

 )f small pox and without effect. These persons were r 

 nfected by touching small pox patients. 



It has therefore been demonstrated that the susceptibili 

 "or small pox is destroyed by vaccinating with the mati 

 jf the cow pox, which is a sure and perfectly harmh 

 ■emedy for that terrible disease. 



The lymph of cow pox is called vaccine-matter (frc 

 )acea, a cow), and its innoculation, vaccination. 



The discovery of Dr. Jenner naturally created the grei 

 >st sensation in the civilized world, and all governmei 

 ;ook speedy measures to enjoy its advantages. At first 

 net with considerable opposition, prejudice and so-call 

 ■eligious scruples. But the force of truth conquered, ai 



