of cowpox poison for smallpox one of the greatest improvements
that has ever been made in medicine. The more I think on the
subject, the more I am impressed with its importance."

The word "vaccination" was coined by the French, so remarkable
for the aptness of their descriptive terms, and it has ever
since remained with us as a convenient expression for the
inoculation of vaccinia as protecting from variola.[4]

[4] It is certainly not necessary to point out that the
principle of vaccination has been one of wide application in
modern medicine. Our word "vaccine" testifies to this. A
vaccine is a liquid, the result of bacterial growth, injected
into a patient in order to render him immune from that
particular disease which is caused by sufficient infection with
the microorganisms in question, e. g., of typhoid fever or of
plague.



Dr. Jenner's views were now becoming known, and the critics and
the doubters had appeared: St. Thomas has always had a large
following. The most formidable of the early objectors was Dr.
Igenhouz, who had come to London to study inoculation for
variola, and had already inoculated, among other notable
persons, the Archduchess Theresa Elizabeth of Vienna. The
careless vaccinations of Doctors Pearson and Woodville at the
London Smallpox Hospital brought much apparent discredit on
Jenner's work. In all his early work Jenner used lymph obtained
directly from papules on the cow or calf, but Woodville in 1799