Whoever undertakes to proceed further in this argument, and endeavours to fix a general criterion of beauty respecting different species, or to show why one species is more beautiful than another, it will be required from him first to prove that one species is really more beautiful than another. That we prefer one to the other, and with very good reason, will be readily granted; but it does not follow from thence that we think it a more beautiful form; for we have no criterion of form by which to determine our judgment. He who says a swan is more beautiful than a dove, means little more than that he has more pleasure in seeing a swan than a dove, either from the stateliness of its motions, or its being a more rare bird; and he who gives the preference to the dove, does it from some association of ideas of innocence which he always annexes to the dove; but if he pretends to defend the preference he gives to one or the other by endeavouring to prove that this more beautiful form proceeds from a particular gradation of magnitude, undulation of a curve, or direction of a line, or whatever other conceit of his imagination he shall fix on, as a criterion of form, he will be continually contradicting himself, and find at last that the great Mother of Nature will not be subjected to such narrow rules. Among the various reasons why we prefer one part of her works to another, the most general, I believe, is habit and custom; custom makes, in a certain sense, white black, and black white; it is custom alone determines our preference of the colour of the Europeans to the Ethiopians, and they, for the same reason, prefer their own colour to ours. I suppose nobody will doubt, if one of their Painters were to paint the Goddess of Beauty, but that he would represent her black, with thick lips, flat nose, and woolly hair; and, it seems to me, he would act very unnaturally if he did not, for by what criterion will anyone dispute the propriety of his idea? We indeed say that the form and colour of the European is preferable to that of the Ethiopian; but I know of no other reason we have for it, but that we are more accustomed to it. It is absurd to say that beauty is possessed of attractive powers, which irresistibly seize the corresponding mind with love and admiration, since that argument is equally conclusive in favour of the white and the black philosophers. The black and white nations must, in respect of beauty, be considered as of different kinds, at least a different species of the same kind; from one of which to the other, as I observed, no inference can be drawn.