[185] Mixture then is a placing side by side of different bodies in no regular order, as if any one were to make a heap, bringing barley, and wheat, and pease, and all sorts of other seeds, all into one mass; but combination is not a placing side by side, but rather a mutual penetration of dissimilar parts entering into one another at all points, so that the distinctive qualities are still able to be distinguished by some artificial skill, as they say is the case with respect to wine and water;