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VIBRATIONS.
The vibrations are, one might say, only fine shaking move-
ments.
The whole or part of the palmar surface of tlie hand or
fingers is used in this kind of manipulation. If we look at the
illustration representing vibration of the thorax (fig. 33), it will
be easier to understand its mechanism. Here, as in th.e shaking,
there is flexion and extension at the elbow, but they are much
smaller. The movements in the loose wrist-joint are abduction
and adduction (i.e. radial and ulnar flexion) of the hand, which
lies immovable, so far as the part of the surface of the body on
which it rests is concerned. Through the quick succession of
the individual movements the vibrations are produced. If
flexion and extension are allowed at the wrist, pressure is caused.
The injurious influence of this in different localities, say over a
weak heart, certainly needs no explanation.
As the vibrations are so often used in order to relieve pain, it
is evident how important it is not to work with a stiff hand and
wrist. Indeed, the entire advantage of the movement is lost
if this be not attended to. On the other hand, when given
correctly, the vibrations are bound to relieve pain, no matter what
the cause of the pain may be.
The straining of the muscles in the operator’s arm ought to
be so slight as to be scarcely perceptible to any one who has his
hand over them.
On no account are the vibrations to be produced by the con-
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