Truly great was the advancement conferred on the arts of architecture, painting, and sculpture by those excellent masters of whom we have written hitherto, in the Second Part of these Lives, for to the achievements of the early masters they added rule, order, proportion, draughtsmanship, and manner; not, indeed, in complete perfection, but with so near an approach to the truth that the masters of the third age, of whom we are henceforward to speak, were enabled, by means of their light, to aspire still higher and attain to that supreme perfection which we see in the most highly prized and most celebrated of our modern works. But to the end that the nature of the improvement brought about by the aforesaid craftsmen may be even more clearly understood, it will certainly not be out of place to explain in a few words the five additions that I have named, and to give a succinct account of the origin of that true excellence which, having surpassed the age of the ancients, makes the modern so glorious. Rule, then, in architecture, was the process of taking measurements from antiquities and studying the ground-plans of ancient edifices for the construction of modern buildings. Order was the separating of one style from another, so that each body should receive its proper members, with no more interchanging between Doric, Ionic, Corinthian, and Tuscan. Proportion was the universal law applying both to architecture and to sculpture, that all bodies should be made correct and true, with the members in proper harmony; and so, also, in painting. Draughtsmanship was the imitation of the most beautiful parts of nature in all figures, whether in sculpture or in painting; and for this it is necessary to have a hand and a brain able to reproduce with absolute accuracy and precision, on a level surface--whether by drawing on paper, or on panel, or on some other level surface--everything that the eye sees; and the same is true of relief in sculpture. Manner then attained to the greatest beauty from the practice which arose of constantly copying the most beautiful objects, and joining together these most beautiful things, hands, heads, bodies, and legs, so as to make a figure of the greatest possible beauty. This practice was carried out in every work for all figures, and for that reason it is called the beautiful manner.