dence.

As we said, these points will be illustrated by examples.

[2] First: _External things are so connected with internal things that
they make one in all that is done._ Let this be illustrated by examples
from several things in man's body. Everywhere in it are things external
and internal. The external are called skins, membranes and coverings; the
internal are forms variously composed and woven of nerve fibres and blood
vessels. The covering over these enters into them by extensions from
itself even to the inmost, so that the external or the covering unites
with the internals or the organic forms of fibres and vessels. It follows
that the internals act and are acted on as the external acts or is acted
on. For they are all constantly bound up together.

[3] Take such a common covering in the body as the pleura, for example,
which covers the chest cavity and the heart and lungs. Examine it in an
anatomical view, or if you do not know anatomy consult anatomists, and
you will learn that this general covering by various circumvolutions and
finer and finer extensions from itself enters into the inmost parts of
the lungs, even into the smallest bronchial branches and into the sacs
themselves which are the beginnings of the lungs, not to mention its
subsequent progress by the trachea into the larynx and toward the tongue.
From this it is plain that there is a constant connection of the outmost
with inmosts; the interiors from the inmosts on therefore act and are
acted upon as the external acts or is acted on. For this reason when that
outmost covering, the pleura, is congested, inflamed or ulcerated, the
lungs labor from their inmost parts; if the disease grows worse, all
action of the lungs ceases and the man dies.

[4] The same is true everywhere else in the body. For instance it is true
of the peritoneum, the general covering of all the abdominal viscera,
also of the coverings on such organs severally as the stomach, liver,
pancreas, spleen, intestines, mesentery, kidneys, and the organs of
generation in both sexes. Choose any one of these viscera, examine it
yourself or consult those skilled in the science, and you will see or
hear. Take the liver, for example; you will find there is a connection
between the peritoneum and that organ and by its covering with its inmost
parts. For the covering puts out constant extensions from itself and
insertions towards the interiors and thus continues to inmosts and as a
result