e immediately utilized by the muscles in heightened or fatiguing
effort. All these experiments point very clearly to reservoirs of power,
both physical and mental, upon which we may draw in times of stress and
under emotional excitement.[12] Such emotionally induced chemical
actions and reactions as have been indicated release these stored
energies, render us for the time being unconscious of fatigue and even
guard us against the too rapid exhaustion of vital power. Whatever
heightens emotion, therefore, modifies the very chemical structure of
the body.

[Footnote 12: Excessive emotional reactions upon bodily states may
explain, as Cannon suggests, the more obscure phenomena of religious
frenzy such as the ceremonial dances of savages, the "Danse Macabre" of
the Middle Ages, the feats of the whirling dervishes, the jumping and
shouting of revivalism; also, maybe, the modern jazz.]

_The Two Doors_

There are other changes as well. The breath is quickened, the lungs are
expanded, waste products are very much more rapidly eliminated and so in
answer to summoning states of the soul the body as a whole readjusts
itself in marvellous subtle forms, mobilizing all its forces for the
contests which the emotion anticipates, or indeed which the emotion
itself calls out. And if all this seems unduly technical it is only to
bear out with something like a scientific accuracy the statements made a
little earlier that two orders meet and merge within us and that the
reactions of our loves, our fears, or our longings upon our bodily
processes may be stated in terms of the test tube and the chemist's
scale.

Such changes as are thus registered react in turn upon mental
attitudes. Fatigue produces mental depression. An accumulation of
uneliminated waste darkens all our horizons; irritability of mind and
soul attend physical irritability; any unhappy modification in the
balance of the physical registers automatically an equally unhappy
modification in the balance of the psychic. Most of us, as we come to
know ourselves better, recognize marked alterations even in spiritual
states which we are taught to refer to physical condition, but just as
truly altered spiritual conditions produce altered physical states.
There is an endless give and take and there are, therefore, two doors of
approach to our pains, wearinesses and sicknesses.

_The Challenge of Hypnotism_

Medicine, surgery and hygiene as at present organized largely appro