This has been pointed out by Dr. Hyde, by Dr. Carmichael, and by Mr. jenner in their respective introductions for Ireland, Scotland, and Cornwall.
"The Fairy-Faith in Celtic Countries"
W. Y. Evans Wentz
10. Tell the story about Dr. jenner and the milkmaids.
"A Handbook of Health"
Woods Hutchinson
A little more than a hundred years ago, an English country doctor by the name of jenner discovered that the cows in his district suffered from a disease accompanied by irritation upon their skins and udders, which was known as "cowpox."
"A Handbook of Health"
Woods Hutchinson