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 or nicety of the operation, and still to find it come true. The muscles ply instinctively to the dictates of habit. Certain movements and impressions of the hand and eye, having been repeated together an infinite number of times, are unconsciously but unavoidable cemented into closer and closer union; the limbs require little more than to be put in motion for them to follow a regular track with ease and certainty; so that the mere intention of the will acts mathematically like touching the spring of a machine, and you come with Locksley in Ivanhoe, in shooting at a mark, “to allow for the wind.”

Farther, what is meant by perfection in mechanical exercises is the performing certain feats to a uniform nicety, that is, in fact, undertaking no more than you can perform. You task yourself, the limit you fix is optional, and no more than human industry and skill can attain to: but you have no abstract, independent standard of difficulty or excellence (other than the extent of your own powers). Thus he who can keep up four brass balls does this to perfection; but he cannot keep up five at the same instant, and would fail every time he attempted it. That is, the mechanical performer undertakes