confined in the body
and turbid, like turbid blood. Hence the disease occurs most commonly
in boys and in those who are careless about cleanliness and neglect
venesection. It is the result of a disposition of the blood resembling
putrescence, in which there occurs an external ebullition in the
efforts of nature to purify the interior of the body and to expel
to the surface the virulent material within. Accordingly the common
people declare that persons who have suffered from _variolae et
morbilli_ never acquire leprosy. Occasionally, too, the disease arises
from excessive corruption of matter in repletion of blood, and hence
it is more frequent in sanguineous diseases, like synocha, and during
the prevalence of south winds or the shifting of winds to the south,
and in infancy--the age characterized particularly by heat and
moisture.

The eruptions vary in color in accordance with the mixture of the
different humors with the corrupt blood. Hence some are light colored,
some the color of saffron, some red, some green, some livid, some
black, and the virulence of the disease is the greater, the nearer
the color approaches to black. There are, too, four varieties of the
eruption, distinguished by special names. When the eruption is light
colored and tends to suppuration, it is called _scora_. When it
is very fine and red, it is called _morbilli_ or _veterana_. The
distinction between _variolae_ and _morbilli_ is in the form and
matter of the disease, for in _variolae_ the pustules are large and
the matter bilious (_colerica_), while in morbilli the eruption is
smaller and does not penetrate the skin (_non-pertransit cutem_).
_Variolae_, on the contrary, forms a prominent pustule (_facit
eminentiam_). A third form of the disease displays only four or five
large, black pustules on the whole body, and this form is the most
dangerous, since it is due to an unnatural black bile, or to acute
fevers, in which the humors are consumed. This variety bears the name
of _pustula_. A fourth form is called _lenticula_. This latter form
occurs sometimes with fever, like synocha, sometimes without fever,
and it arises from pestilential air or corrupt food, or from sitting
near a patient suffering from the disease, the exhalations of which
are infectious.

The premonitory symptoms of _variolae_ are a high fever, redness of
the eyes, pain in the throat and chest, cough, itching of the nose,
sneezing and pricking sensations over the surface