§ XXXV. The reader has been told repeatedly[89] that there are two, and only two, real orders of capitals, originally represented by the Corinthian and the Doric; and distinguished by the concave or convex contours of their bells, as shown by the dotted lines at _e_, Fig. V., p. 65. And hitherto, respecting the capital, we have been exclusively concerned with the methods in which these two families of simple contours have gathered themselves together, and obtained reconciliation to the abacus above, and the shaft below. But the last paragraph introduces us to the surface ornament disposed upon these, in the chiselling of which the characters described above, § XXVIII., which are but feebly marked in the cornice, boldly distinguish and divide the families of the capital. § XXXVI. Whatever the nature of the ornament be, it must clearly have relief of some kind, and must present projecting surfaces separated by incisions. But it is a very material question whether the contour, hitherto broadly considered as that of the entire bell, shall be that of the _outside_ of the projecting and relieved ornaments, or of the _bottoms of the incisions_ which divide them; whether, that is to say, we shall first cut out the bell of our capital quite smooth, and then cut farther into it, with incisions, which shall leave ornamental forms in relief, or whether, in originally cutting the contour of the bell, we shall leave projecting bits of stone, which we may afterwards work into the relieved ornament. § XXXVII. Now, look back to Fig. V., p. 65. Clearly, if to ornament the already hollowed profile, _b_, we cut deep incisions into it, we shall so far weaken it at the top, that it will nearly lose all its supporting power. Clearly, also, if to ornament the already bulging profile _c_ we were to leave projecting pieces of stone outside of it, we should nearly destroy all its relation to the original sloping line X, and produce an unseemly and ponderous mass, hardly recognizable as a cornice profile. It is evident, on the other hand, that we can afford to cut into this profile without fear of destroying its strength, and that we can afford to leave projections outside of the other, without fear of destroying its lightness. Such is, accordingly, the natural disposition of the sculpture, and the two great families of capitals are therefore distinguished, not merely by their concave and convex contours, but by the ornamentation being left outside the bell of the one, and cut into the bell of the other; so that, in either case, the ornamental portions will fall _between the dotted lines_ at _e_, Fig. V., and the pointed oval, or vesica piscis, which is traced by them, may be called the Limit of ornamentation.