rder of phenomena. Health is a word of manifold meaning and if its
foundations are established in the harmonious cooeperation of physical
processes, its superstructure rises through mental attitudes into what,
for want of a more clearly defined word, we call spiritual states. Two
orders meet and merge within us. Above a world of idea, insight, desire
and subordination of means to ends, the whole driven by the will and
saturated with emotion, a world which has its contacts with the unseen
and eternal and derives its strength from the truly immaterial; below a
world of material and forces in subjection to the laws of physics and
chemistry and involved in the processes of the conservation and
transformation of physical energy, and consciousness the clearing-house
for the whole.

_Cannon's Study of Emotional Reactions Upon Physical States_

This interplay of body and mind has of late been made the subject of
careful and long continued experimentation with a special reference to
the reactions of strong emotion upon bodily states, particularly as
registered in chemical changes. These experiments have been carried on
with an almost incredible patience and attention to detail under the
most difficult circumstances, and their conclusions seem final.
Professor Walter B. Cannon of Harvard University has recently put the
result of such investigation at our service in a most interesting
way.[9] (It ought to be said, however, that a similar series of
experiments repeated at the laboratories of the University of Chicago
failed to produce the same results.)

[Footnote 9: "Bodily Changes in Pain, Hunger, Fear and Rage," quoted
without page references.]

Strong emotion affects almost every physical region, modifies almost
every physical function. The normal secretion of digestive fluids is
greatly increased by hunger (though here, of course, hunger itself may
have a physical basis) and also by what the investigator calls sham
feeding--food, that is, taken by an animal and so deflected as not to
pass into the digestive tract at all stimulates the gastric flow quite
as much as if it were actually received into the stomach. On the other
hand unhappy emotional disturbance greatly retards the digestive
processes. Pain, for example, results in pronounced inhibitions of the
secretion of gastric juice while happy emotional states produce
naturally the opposite effect. Pain is often accompanied by nausea,
indeed the nausea of a sick headach