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It seems probable that the eyes become trained to replace the muscle sense to a noteworthy degree, but there is in addition apparently a re-education of the muscle-sense.

The muscle sense informs us of movements of the joints and of positions of the limbs, as well as of resistance encountered by any movement.

So far as these experiments go there appear to be at least four sensory factors of importance in the formation of a simple labyrinth habit: the chemical sense, touch, vision and the muscle sense.

This sense accordingly might better be called the "muscle, tendon and joint sense", but the shorter term, "muscle sense", bids fair to stick.

It is known that the rat makes little use of the sense of sight in learning the maze, guiding himself mostly by the muscle sense.