art which is unusually sensitive. All
portions of the arm from the shoulder down are successively included in
the rubbers, while a suitable degree of reciprocating or rubbing action
is obtained by giving motion to the wheel.

To apply the same operation to the other arm, the patient may either
turn in his seat or change his position to the opposite side of the
machine.

If any portion of the extremity is affected with inflammation or
swelling, it is necessary to apply the action described to the whole of
the unaffected portion first; after this the affected part may be
beneficially operated on, provided that the sensations are strictly
heeded, and that it is so managed that only a comfortable feeling is
produced.

[Illustration: Fig. 8.
Oscillating the Arms and Chest.]

In Fig. 5, the patient is so seated beside the machine that he can
insert one thigh between the pads of the rubber, and also control the
lever with the hand. It is sometimes more convenient to suspend a
movable weight from the lever. While the machine is running, he can
withdraw the leg gradually, as each portion receives its proper amount
of action, till the whole, including the foot, becomes glowing with the
effect. The boot or shoe affords no impediment to the effect, and should
remain on.

[Illustration: Fig. 9.
Oscillating the Legs.]

Sometimes, especially in the beginning, or when the feet are habitually
cold, it is better to apply the action only from the knees down.

The rubbing-pad (d) may be attached to either side of the machine,
according to convenience or effect sought. The action derived from the
right end of the rock-shaft is much less severe than that from the left,
on account of the shape of the rubber appendage, and at the beginning
should be used in preference. In Fig. 6, the patient sits on an ordinary
stool, or, if feeble, in a chair, and presents any portion of the chest
or abdomen to the action of the rubber. The instrument is raised or
lowered to suit convenience, while the patient gently presses portions
of the trunk successively upon the rubbing-pad. The degree of the effect
is thus always under the absolute control of the one receiving the
action. This operation, like the preceding, produces great heat, reddens
the skin, relieves pain, and greatly stimulates the functions, not only
of the skin, but of the organs contained in the cavities of the chest
and the abdomen.

[Illustration: Fig. 10.
Vibrator operated by Ma