Jackson's Gymnastics for the Fingers and Wrist being a system of gymnastics, based on anatomical principles, for developing and strengthening the muscles of the hand for musical, mechanical and medical purposes: with thirty-seven diagrams

c. Contractors of the fingers, rising from the hand itself, between

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the bones of the middle-hand (Fig. 4 _b_), and extending as far as the first finger-joint (Fig. 4 _b_).