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its whole course. In an habitual action, mere sensation is a sufficient guide, and the upper regions of brain and mind are set comparatively free. A diagram will make the matter clear:

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Let A, B,C, D, E, F, G represent an habitual chain of muscular contractions, and let a, b, c, d, e, f stand for the respective sensations which these contractions excite in us when they are successfully performed. Such sensations will usually be of the muscles, skin, or joints of the parts moved, but they may also be effects of the movement upon the eye or the ear. Through them, and through them alone, we are made aware