but Jenner is in illustrious company, a prince amongst the
hierarchy of the misunderstood.

The facts or surmises before Jenner at this date, then,
were--(a) Cowpox produces an eruption extremely like that of
mild smallpox, it is, therefore, probably a form of smallpox
modified by transmission through the cow; (b) And an attack of
cowpox protects from smallpox. To test these things
experimentally some one must first be inoculated with cowpox,
and, having recovered from the vaccinia, that same person must,
secondly, be inoculated with the virus of smallpox or be
exposed to the infection, and, thirdly, this person ought not
to take the disease.

In 1788 Jenner had a careful drawing made of the hand of a
milkmaid suffering from cowpox to demonstrate to Sir Everard
Home how exceedingly similar were vaccinia and variola. Home
agreed it was "interesting and curious," and the subject began
to attract some attention in medical circles.

In November, 1789, Dr. Jenner inoculated his eldest child
Edward, aged 18 months, with some swinepox virus, and as
nothing untoward happened, he inoculated him again with
swinepox on April 7, 1791. The child had a slight illness, very
like vaccinia, from which he rapidly recovered. The moment for
the crucial experiment was not yet; it came in due time, but
Jenner had to wait five years for it, and five years are a long
time to a man who is yearning to perform his crucial
experiment. Happily for suffering humanity, in the early summer
of 1796 the opportunity came; the hour and the man were there