In the highest and most perfect form of hand, thin, delicate, conical fingers are combined with a moderate-sized palm and a well-developed thumb,—both the sensitive and motive parts are in nice and accurate adaptation; the instrument being thus rendered capable of executing whatever the intellect may desire: such a hand we term “psychical.” In the lowest form of hand, the member retains throughout adult life the character which it presented in infancy, and it strikingly resembles the hand of those of the monkey tribe most nearly allied to man in their organisation and outward form,—a hard, thick, palm being joined to short, rudimentary fingers: such a form of hand we style “elementary.” It is mostly associated with a crude, undeveloped state of the intellectual powers. Thus, by tracing the normal developement and the anatomy and physiology of the hand, we have obtained four definite types of formation founded upon anatomical and physiological characters, and corresponding to a certain extent to the temperaments,—the psychical as the highest form, the elementary as the lowest, and, as intermediate forms, the sensitive and the motive. The sensitive is characterised by softness, delicacy, and a rounded form,—by a member adapted by its structure for an accurate discrimination of the external world, and for a delicate organ of sensation; the motive, by great developement of the muscular, tendinous, and osseous structures, and exercising its objective influence by virtue of its active movements and its physical force; the psychical uniting the perfections of both the sensitive and the motive types, the elementary without the excellencies of either. We pass on to a somewhat more detailed examination of the several parts of the hand. It may be considered as made up of the palm, the thumb, and the fingers.