persons who had acquired cowpox by handling cattle, but
especially by milking cows, were immune from smallpox
It appears to have been understood before Jenner"s time that
persons who had acquired cowpox by handling cattle, but
especially by milking cows, were immune from smallpox. In the
reign of Charles II. it is well known that the court beauties
envied the dairy-maids because having had cowpox, they could
not take smallpox which all women so dreaded. Dr. Corlett tells
us that the Duchess of Cleveland, one of the King"s mistresses,
on being told that she might lose her place in the royal favor
if she were disfigured by smallpox, replied that she had
nothing to fear as she had had cowpox. In 1769 a German, Bose,
wrote on the subject of cowpox protecting from smallpox. In the
year 1774 a cattle dealer, Benjamin Jesty, at Yetminster, in
Dorset, inoculated his wife and three children with cowpox.
None of them ever took smallpox during the rest of their lives
although frequently exposed to its infection. Jesty died in
1816, and it is recorded on his tombstone that he was the first
person who inoculated cowpox to protect from smallpox. Cowpox,
or vaccinia, though infectious for cows, is not transmissible
among human beings, in other words, as a disease of man it is
not infectious. Edward Jenner, the Englishman of Berkeley in
Gloucestershire, was the first person to think scientifically
on the fact that cowpox protected from smallpox. John Hunter
had said to him, 'Jenner, don"t think, try.' Luckily, however,
he did both. Thinking alone avails little, experimentation
alone avails not much, but the one along with the other has
removed mountains. Just as Newton thought scientifically about
that falling apple and reduced our conceptions of the universe
to order, just as Watt thought scientifically about that
kettle-lid lifted by the steam and so introduced the modern era
of mechanical power brought under man"s control, so Jenner
thought about and experimented with cowpox until he had
satisfied himself that he had discovered something which would
rid the human race forever of the incubus of an intolerable
pestilence.
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