[Pozarica-joel] He activities of mankind considerably by intensifyi

[Rookard]

 evolved without
clothing and the body was bathed with light throughout the day, but civilization has gone to the other
extreme of covering the body with clothing which keeps most of it in darkness. Inasmuch as light and the invisible radiant energy which is associated with
it are known to be very influential agencies in a multitude of ways, the question arises: Has this shielding of the body had
any marked influence upon
the human organism? Although
there is a vast literature upon the subject of light-therapy, the question remains unanswered,
owing to the conflicting results and the absence of standardization of experimental details. In fact, most investigations are subject to the criticism that the data are inadequate. Throughout many centuries light has been credited with various influences upon physiological
processes and upon the mind. But most of the early applications had no foundation of scientific facts. Unfortunately, many of the claims pertaining to the physiological
and psychological effects

of light at the

present time are conflicting and they do not rest upon an established scientific foundation. Furthermore some of them
are at variance with the possibilities and an unprejudiced observer

must conclude that much systematic work must be done before
order may arise from the present chaos. This does not mean that many of the effects are not real, for radiant
energy is known to cause certain effects, and

viewing the subject broadly it appears that light is already serving humanity in
this field

and that its future is promising. The present
lack of definite data pertaining to the effects of radiation is due to the failure of most investigators to
determine accurately the quantities and wave-lengths of the rays involved. For example, it is easy to err by
attributing an effect to visible rays when the effect may be caused by accompanying
invisible rays. Furthermore,
it may be possible that certain rays
counteract or aid the effective rays without being effective alone. In other words, the physical measurements have been neglected notwithstanding the

fact that they are generally
more easily made than the determinations of curative
effects or of germicidal

action. Radiant energy of all kinds and wave-lengths has played a part in therapeutics, so it is of interest
to indicate them according to wave-length or f
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