To be somewhat more explicit. As to the first part, I shall begin with shewing what practicable sort of measuring may be used in order to produce the most proper variety in the proportions of the parts of any body. I say, _practicable_, because the vast variety of intricately situated parts, belonging to the human form, will not admit of measuring the distances of one part by another, by lines or points, beyond a certain degree or number, without great perplexity in the operation itself, or confusion to the imagination. For instance, say, a line representing one breadth and an half of the wrist, would be equal to the true breadth of the thickest part of the arm above the elbow; may it not then be ask'd, what part of the wrist is meant? for if you place a pair of calipers a little nearer or further from the hand, the distance of the points will differ, and so they will if they are moved close to the wrist all round, because it is flatter one way than the other; but suppose, for argument sake, one certain diameter should be fix'd upon; may it not again be ask'd, how is it to be apply'd, if to the flattest side of the arm or the roundest, and how far from the elbow, and must it be when the arm is extended or when it is bent? for this also will make a sensible difference, because in the latter position, the muscle, call'd the biceps, in the front of that part of the arm, swells up like a ball one way, and narrows itself another; nay all the muscles shift their appearances in different movements, so that whatever may have been pretended by some authors, no exact mathematical measurements by lines, can be given for the true proportion of a human body. [Illustration: Figs. 68 and 55]