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Rh its essentially automatic character is virtually admitted. The physiological explanation, that the mechanism of locomotion, as of habitual movements, grows to the mode in which it is early exercised, and that it then works automatically under the general control and direction of the will, can scarcely be put down by any assumption of an hypothetical necessity, which rests only on the basis of ignorance of one side of our composite nature."

But if not distinct acts of will, these immediate antecedents of each movement of the chain are at any rate accompanied by consciousness of some kind. They are sensations to which we are usually inattentive, but which immediately call our attention if they go wrong. Schneider's account of these sensations deserves to be quoted. In the