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SECT.  XXXVII.  Of the Arms and their Use.

From the top of that precious fabric we have described hang the two arms, which are terminated by the hands, and which bear a perfect symmetry one with another.  The arms are knit with the shoulders in such a manner that they have a free motion, in that joint.  They are besides divided at the elbow and at the wrist that they may fold, bend, and turn with quickness.  The arms are of a just length to reach all the parts of the body.  They are nervous and full of muscles, that they may, as well as the back, be often in action and sustain the greatest fatigue of all the body.  The hands are a contexture of nerves and little bones set one within another in such a manner that they have all the strength and suppleness necessary to feel the neighbouring bodies, to seize on them, hold them fast, throw them, draw them to one, push them off, disentangle them, and untie them one from another.

The fingers, the ends of which are armed with nails, are by the delicacy and variety of their motions contrived to exercise the most curious and marvellous arts.  The arms and hands serve also, according as they are either extended, folded, or turned, to poise the body in such a manner as that it may stoop without any danger of falling.  The whole machine has, besides, independently from all after-thoughts, a kind of spring that poises it on a sudden and makes it find the equilibrium in all its different postures and positions.

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