later stages. Delirium and convulsions in children are
also frequent, as well as diarrhea; but these may almost be regarded
as natural accompaniments of the disease. Among the less common
complications are: laryngitis, pneumonia, diseases of the heart,
insanity, paralysis, various skin eruptions, inflammation of the
joints and of the eyes and ears, and baldness.

=Treatment.=--Prevention is of greatest importance. Vaccination stands
alone as the most effective preventive measure in smallpox, and as
such has no rival in the whole domain of medicine. The modern method
includes the inoculation of a human being with matter taken from one
of the eruptive points on the body of a calf suffering with cowpox.
Whether cowpox is a modified form of smallpox or a distinct disease is
unknown.

The period of protection afforded by a successful vaccination is
uncertain, because it varies with different individuals. In a general
way immunity for about four or five years is thus secured; ten or
twelve years after vaccination the protection is certainly lost and
smallpox may be then acquired. Every individual should be vaccinated
between the second and third month after birth, and between the ages
of ten and twelve, and at other times whenever an epidemic threatens.
An unvaccinated person should be vaccinated and revaccinated, until
the result is successful, as immunity to vaccination in an
unvaccinated person is practically unknown. When unsuccessful, the
vaccine matter or the technique is faulty. A person continuously
exposed to smallpox should be vaccinated every few weeks--if
unsuccessful, no harm or suffering follow; if successful, it proves
liability to smallpox. A person previously vaccinated successfully may
"take" again at any time after four or five years, and, in event of
possible exposure to smallpox, should be revaccinated several times
within a few weeks--if the vaccination does not "take"--before the
attempt is given up. An unvaccinated person, who has been exposed to
smallpox, can often escape the disease if successfully vaccinated
within three days from the date of the exposure, but is not sure to
do so.

Diseases are not introduced with vaccination now that the vaccine
matter is taken from calves and not from the human being, as formerly.
Most of the trouble and inflammation of the vaccinated part following
vaccination may be avoided by cleanliness and proper care in
vaccinating.

In the absence of a physician, vac