Thus amongst the blades of grass or leaves of the same tree, though no two can be found exactly alike, the general form is invariable: a Naturalist, before he chose one as a sample, would examine many; since if he took the first that occurred, it might have by accident or otherwise such a form as that it would scarce be known to belong to that species; he selects as the Painter does, the most beautiful, that is, the most general form of nature. Every species of the animal as well as the vegetable creation may be said to have a fixed or determinate form, towards which Nature is continually inclining, like various lines terminating in the centre; or it may be compared to pendulums vibrating in different directions over one central point: and as they all cross the centre, though only one passes through any other point, so it will be found that perfect beauty is oftener produced by Nature than deformity: I do not mean than deformity in general, but than any one kind of deformity. To instance in a particular part of a feature; the line that forms a ridge of the nose is beautiful when it is straight; this, then, is the central form, which is oftener found than either concave, convex, or any other irregular form that shall be proposed. As we are then more accustomed to beauty than deformity, we may conclude that to be the reason why we approve and admire it, as we approve and admire customs and fashions of dress for no other reason than that we are used to them; so that though habit and custom cannot be said to be the cause of beauty, it is certainly the cause of our liking it; and I have no doubt but that if we were more used to deformity than beauty, deformity would then lose the idea now annexed to it, and take that of beauty: as if the whole world should agree, that _yes_ and _no_ should change their meaning; _yes_ would then deny, and _no_ would affirm.