An Inquiry Into the Causes and Effects of the Variolæ Vaccinæ, Or Cow-Pox, by Edward Jenner

<p>Edward Jenner found that disease in the heel of a horse, transmitted through a cow to the dairy attendants, was an agent in making human beings immune from smallpox. His amazing experiments inaugurated a new epoch. (Volume 38, Harvard Classics)</p> <p>Edward Jenner makes his first vaccination May 14, 1796.</p> <p> </p>