adjusted, but leave a train of after effects.

So with loss or insufficiency of the thyroid, there may be pituitary
overgrowth, because the pituitary may act as vicar for the thyroid.
The thyroid and thymus are antagonistic, for the thyroid hastens
differentiation, puberty and the coming of sexual maturity, while the
thymus delays and retards them and prolongs the period of childhood.
The thyroid and the pancreas are antagonists, for when the thyroid
has been excised, the pancreas appear no longer necessary to act as a
break upon the mechanism of sugar liberation into the blood from
the liver. The thyroid stimulates the interstitial glands, for
menstruation and pregnancy are impossible with no thyroid or an
insufficient thyroid. Removal of the pituitary makes the thymus shrink
because the restraining influence of the latter is no longer needed.
But there is an enlargement of the thyroid to compensate. In castrates
there is an increase in the size and number of the cells of the
anterior pituitary, again a compensation or substitution effect. The
pituitary and the adrenal cortex are mutually assistant, alike in
their influence upon the tone of the brain and sex cells.

THE KINETIC SYSTEM

So there are combinations of glands to assist or restrain others, or
to control a body function, or to determine the domination or abeyance
of an instinct. One such has been named the kinetic system because it
comes into play in situations which demand prompt adaptation without
hesitancy, and a consequent immediate transformation of static or
stored energy into kinetic or active energy. According to this
conception the brain, the adrenals, the liver, the thyroid and the
muscles together constitute a machine very much like an automobile.
The self-starter of the machine is the brain, with storage battery
(composed of stored past memories) and ignition combined. The thing
seen without, or the idea felt within, act as the initial sparks,
while the adrenals, as the carburetors, permit the freer flow of fuel,
sugar, from the liver. The thyroid works as the accelerator, the
original impulse finally landing upon muscles keyed up and supplied
with food to meet the situation, be it that of removing a poison,
removing an aggressor (attack) or removing the individual himself
(running away). When one is exhausted by exertion and emotion, injury,
intoxication or infection, it is these members of the kinetic system,
the brain, the adrenals, thyroid