The methods of fixing a standard and defining the proportions of the human frame, are either _analytic_ or _synthetic_, from the whole to the parts, or from the parts to the whole, and have been promiscuously adopted. The human is the measure of perfection in Vitruvius; he applies its rules to architecture, and indeed to every object of taste. The length of human proportion in Vitruvius, measured by a perpendicular, or a horizontal, from the middle finger points of both arms extended, is ten heads, the head measured from the chin to the hair-roots of the front; and eight if the head be measured from the extremity of the chin to the vertex of the crown. Three is the favourite number by which the theorists of proportion have divided the human structure, as containing a beginning, a middle, and an end; and Pliny observes that we attain the half of our growth in the third year. The body, as well as all its members, consists of three main parts, which correspond with each other, in the same proportion as the parts of the subordinate members among themselves: the head and body are in the same unison of measure with the thighs and legs, as the thighs with the legs and feet, or the upper part of the arm to the elbow and the hand. Thus the face is divided into three parts, or three times the length of the nose: never into four, as some have imagined; for the upper part of the head, from the hair-roots on the front to the top, measured perpendicularly, has only three-fourths of the nose length, or is in proportion to the nose as nine to twelve. The rules of proportion originated, probably, with sculpture, but in the progress of art received their final determination from the painter: this is the praise of Parrhasius, and Praxiteles applied to Nicias for the ultimate decision and refinement of his forms. The foot was the main medium of ancient measurement; and six feet, according to Vitruvius, became the measured length of proportion for their statues. Measure is the method of ascertaining an unknown quantity from a known one; and the proportion of the foot is subject to less variation than the head or face. Lomazzo, when he makes the foot of Hercules the seventh part of his length, and fixes ten faces as the standard of ancient proportion for a Venus, nine for a Juno, and eight for Neptune, talked from fancy, and relied on the credulity of his reader. This relation of the foot to the whole fabric, as established by Nature, the ancients regulated according to ideal or divine, and human or characteristic proportions. Of the Apollo, whose height is somewhat more than seven heads, the standing foot is three inches of a Roman palm longer than the head. The Medicean Venus, however 'suelt,' however small her head, has in length no more than seven heads and a half; and yet her foot measures a palm and a half, and the whole height of the figure six palms and a half.