214 EDWARD JENNER 



on the human subject has been uniform. In every instance 

 the patient who has felt its influence, has completely lost 

 the susceptibility for the variolous contagion; and as these 

 instances are now become numerous, I conceive that, joined 

 to the observations in the former part of this paper, they 

 sufficiently preclude me from the necessity of entering into 

 controversies with those who have circulated reports ad- 

 verse to my assertions, on no other evidence than what 

 has been casually collected. 



Ill 



A CONTINUATION OF FACTS AND OBSERVATIONS RELATIVE 

 TO THE VARIOLA VACCINE, OR COW-POX. 1800 



SINCE my former publications on the vaccine inoculation 

 I have had the satisfaction of seeing it extend very widely. 

 Not only in this country is the subject pursued with ar- 

 dour, but from my correspondence with many respectable 

 medical gentlemen on the Continent (among whom are Dr. 

 De Carro, of Vienna, and Dr. Ballhorn, of Hanover) I 

 find it is as warmly adopted abroad, where it has afforded 

 the greatest satisfaction. I have the pleasure, too, of see- 

 ing that the feeble efforts of a few individuals to depreciate 

 the new practice are sinking fast into contempt beneath 

 the immense mass of evidence which has arisen up in 

 support of it. 



Upwards of six thousand persons have now been inocu- 

 lated with the virus of cow-pox, and the far greater part 

 of them have since been inoculated with that of small- 

 pox, and exposed to its infection in every rational way 

 that could be devised, without effect. 



It was very improbable that the investigation of a 

 disease so analogous to the smallpox should go forward 

 without engaging the attention of the physician of the 

 Smallpox Hospital in London. 



Accordingly, Dr. Woodville, who fills that department 

 with so much respectability, took an early opportunity 

 of instituting an inquiry into the nature of the cow-pox. 

 This inquiry was begun in the early part of the present 

 year, and in May, Dr. Woodville published the result, 





