same way that they are now vaccinated for small-pox.

Small-pox was at one time a scourge throughout the world, and fearful
outbreaks of this plague would occur wherever numbers of people were
gathered together.

About the year 1718 an English lady travelling in Turkey noticed that
inoculation was practised in that country with the greatest success, and
that epidemics were greatly prevented thereby.

This lady, Lady Mary Wortley Montagu, introduced the practice into
England.

The idea was to introduce into the blood the germs of the dreaded
disease, practically giving the patient a slight attack of small-pox,
which made him proof against another attack.

Inoculation was, however, objected to, because sometimes the person
operated on took the disease in its violent form, and died from the
results.

The fact, however, remained that people who had been inoculated were not
liable to take the disease again, and so much good resulted that the
physicians were constantly seeking a means of inoculating that would
insure only a mild form of the disease.

The problem was at last solved by the great English physician, Edward
Jenner, in 1798.

He found that a form of small-pox was prevalent among cows, and that by