The anchoring fingers must always extend away from the adjuster. To turn the fingers back across the spine, in moving a vertebra toward you, is always an error, and the price is partial loss of use of one arm. With the adjusting hand satisfactorily placed, grasp its wrist firmly with the other hand so that the pisiform of the supporting hand rests in the hollow between the wrist and the metacarpal bone of the extended thumb. By this contact force is driven directly through the chain of bones across the wrist and to the pisiform bone without spreading. In grasping the wrist let the thumb extend around the forearm in one direction and the four fingers in the other. Beware of gripping only with thumb and first finger in which case the edge of the supporting hand will rest on the back of the contact hand and spread the delivered force too widely. [Illustration: Fig. 22. “The Recoil.” Ready for the movement.] Movement I have said, but have not sufficiently emphasized the command, that the shoulders must be dropped loosely forward. Let me add that just before the movement is given the head should be allowed to sag downward and the muscles to become relaxed. This movement given with stiff shoulders and upraised head becomes a _push_. The desired movement is a _throwing_ movement. Force is released from both shoulders at once, concentrated at the same instant by a slight shifting forward of the elbows, and strikes the spinous process as _one_ force, which is the resultant of the two meeting at the wrist of contact hand and being united there. The two arms use the contact hand as a passive instrument for driving the vertebra. The objective point, the distance to which the movement is mentally thrown at the instant of delivery, should be the center of mass of the vertebra, varying according to the section of the spine. Contact Point The exact contact point of hand with vertebra varies. If the vertebra is to be moved toward the right the pisiform rests _against_ (not _upon_) the left side of the spinous; if toward the left and inferior, against the right side and just above, in the notch between it and the next superior process. The rule is to so place hand that the spinous process is between the pisiform and the direction to which movement is given. On the hand the contact may be said to vary, according to the direction of subluxation and position of adjuster, so as to describe a circle around the pisiform in the course of the various changes of position necessary to the use of this movement. No error could be greater than to attempt to use always the same face of the pisiform and to adapt the position of hands and arms to this end, when any face or aspect of the little bone is equally good with any other. Which Hand Used