So far then as taste belongs to the imagination, its principle is the same in all men; there is no difference in the manner of their being affected, nor in the causes of the affection; but in the _degree_ there is a difference, which arises from two causes principally; either from a greater degree of natural sensibility, or from a closer and longer attention to the object. To illustrate this by the procedure of the senses, in which the same difference is found, let us suppose a very smooth marble table to be set before two men; they both perceive it to be smooth, and they are both pleased with it because of this quality. So far they agree. But suppose another, and after that another table, the latter still smoother than the former, to be set before them. It is now very probable that these men, who are so agreed upon what is smooth, and in the pleasure from thence, will disagree when they come to settle which table has the advantage in point of polish. Here is indeed the great difference between tastes, when men come to compare the excess or diminution of things which are judged by degree and not by measure. Nor is it easy, when such a difference arises, to settle the point, if the excess or diminution be not glaring. If we differ in opinion about two quantities, we can have recourse to a common measure, which may decide the question with the utmost exactness; and this, I take it, is what gives mathematical knowledge a greater certainty than any other. But in things whose excess is not judged by greater or smaller, as smoothness and roughness, hardness and softness, darkness and light, the shades of colors, all these are very easily distinguished when the difference is any way considerable, but not when it is minute, for want of some common measures, which perhaps may never come to be discovered. In these nice cases, supposing the acuteness of the sense equal, the greater attention and habit in such things will have the advantage. In the question about the tables, the marble-polisher will unquestionably determine the most accurately. But notwithstanding this want of a common measure for settling many disputes relative to the senses, and their representative the imagination, we find that the principles are the same in all, and that there is no disagreement until we come to examine into the pre-eminence or difference of things, which brings us within the province of the judgment.