We have--though, of course, in lesser degree--all the color and line pictures with which we have been dealing upon the face. Though not an index of any special system, it has the great advantage of being our one approach to an indication of the general muscular tone of the body, as indicated both in its grasp and in the poses it assumes at rest. The patient with a limp and nerveless hand-clasp, whose hand is inclined to lie palm upward and open instead of palm downward and half-closed, is apt to be either seriously ill, or not in a position to make much of a fight against the attack of disease. The nails furnish one of our best indices of the color of the blood and condition of the circulation. Our best surface test of the vigor of the circulation is to press upon a nail, or the back of the finger just above it, until the blood is driven out of it, and when our thumb is removed from the whitened area to note the rapidity with which the red freshet of blood will rush back to reoccupy it. In the natural growth of the nail, traveling steadily outward from root to free edge, its tissues, at first opaque and whitish, and thus forming the little white crescent, or _lunula_, found at the base of most nails, gradually become more and more transparent, and hence pinker in color, from allowing the blood to show through. During a serious illness, the portion of the nail which is then forming suffers in its nutrition, and instead of going on normally to almost perfect transparency, it remains opaque. And the patient will, in consequence, carry a white bar across two or three of his nails for from three to nine months after the illness, according to the rate of growth of his nails. Not infrequently this white bar will enable you to ask a patient the question, "Did you not have a serious illness of some sort two, three, or six months ago?" according to the position of the bar. And his fearsome astonishment, if he answers your question in the affirmative, is amusing to see. You will be lucky if, in future, he doesn't incline to regard you as something uncanny and little less than a wizard. Another of the score of interesting changes in the hand, which, though not very common, is exceedingly significant when found, is a curious thickening or clubbing of the ends of the fingers, with extreme curvature of the nails, which is associated with certain forms of consumption. So long has it been recognized that it is known as the "Hippocratic finger," on account of the vivid description given of it by the Greek Father of Medicine, Hippocrates. It has lost, however, some of its exclusive significance, as it is found to be associated also with certain diseases of the heart. It seems to mean obstructed circulation through the lungs.