secretion. Terror, or an absorbing interest of any kind, will produce a
dilatation of the pupil, and communicate in this way a peculiarly wild
and unusual expression to the eye. Disagreeable sights or odors, or even
unpleasant occurrences, are capable of hastening or arresting the
menstrual discharge, or of inducing premature delivery."

_Third_.--"Reflex actions taking place through the sympathetic system
from one part of the body to another.--The contact of food with the
mucous membrane of the small intestine excites a peristaltic movement in
the muscular coat. The mutual action of the digestive, urinary, and
internal generative organs upon each other takes place entirely through
the medium of the sympathetic ganglia and their nerves. The variation of
the capillary circulation in different abdominal viscera, corresponding
with the state of activity or repose of their associated organs, are to
be referred to a similar nervous influence. These phenomena are not
accompanied by any consciousness on the part of the individual, nor by
any apparent intervention of the cerebro-spinal system."

* * * * *




CHAPTER XIII.

THE SPECIAL SENSES.

SIGHT.