"It is not," says Buffon, "by the comparison of the body of one man with that of another man, or by measures actually taken in a great number of subjects, that we can acquire this knowledge [that of proportion]: it is by the efforts which have been made exactly to copy and imitate nature; it is to the art of design that we owe all that we know in this respect. Feeling and taste have done all that mechanics could not do; the rule and the compass have been quitted in order to profit by the eye; all the forms, all the outlines, and all the parts of the human body, have been realized in marble; and we have known nature better by the representation than by nature itself. It is by great exercise of the art of design and by an exquisite sentiment, that great statuaries have succeeded in making us feel the just proportions of the works of nature. The Greeks have formed such admirable statues, that with one consent they are regarded as the most exact representation of the most perfect human body. These statues, which were only copies from man, are become originals, because these copies were not made from any individual, but from the whole human species well observed, so well indeed, that no man has been found whose figure is so well proportioned as these statues: it is then from these models that the measures of the human body have been taken." It is now necessary to lay before the reader the principles of the Greeks, as to the proportions of the human body. Much has been well done on this subject by Winckelmann, Bossi, and others; but, at the same time, from want of enlarged anatomical and physiological views, they have overlooked some fundamental considerations, and have failed to unravel the greatest difficulties which the subject presents. That the reader may be satisfied of the accuracy of my representations, I shall lay the statements of these writers before him in their own words, rendering them only as succinct as possible.[44] Of the first epoch of art among the Etruscans and Greeks, Mengs says: "They preferred the most necessary things to those which were less so; and therefore they directed their attention first to the muscles, and next to _proportion_, these constituting the two parts the most useful and necessary of the human form; and this is, throughout, the character of their primitive taste. All this we observe in history, and in the divine and human figures which they have represented. "In these figures," he farther observes, "we find a proportion, impossible to be known and practised, without an art which furnishes sure _rules_. These rules could not be founded otherwise than in proportion, which was invented and practised by the Greeks."