dicate in some way the entablature and an order. Real pillars, and also consoles and supports of various kinds, realise more that pure separation of support and burden which is striven after throughout by architecture. In this respect, next to the column with the entablature, but as a special construction not imitating it, stands the vault with the pillar. The latter certainly is far from attaining to the æsthetic effect of the former, because here the support and the burden are not purely separated, but are fused, passing over into each other. In the vault itself every stone is at once burden and support, and even the pillars, especially in groined vaulting, are, at least apparently, held in position by the pressure of opposite arches; and also just on account of this lateral pressure not only vaults but even mere arches ought not to rest upon columns, but require the massive four-cornered pillars. In the row of columns alone is the separation complete, for here the entablature appears as pure burden, the column as pure support. Accordingly the relation of the colonnade to the plain wall may be compared to that which would exist between a scale ascending in regular intervals and a tone ascending little by little from the same depth to the same height without gradation, which would produce a mere howl. For in the one as in the other the material is the same, and the important difference proceeds entirely from the pure separation.
Moreover, the support is not adapted to the burden when it is only sufficient to bear it, but when it can do this so conveniently and amply that at the first glance we are quite at ease about it. Yet this superfluity of support must not exceed a certain degree; for otherwise we will perceive support without burden, which is opposed to the æsthetic end. As a rule for determining that degree the ancients devised the line of equilibrium, which is got by carrying out the diminution of the thickness of the column as it ascends till it runs out into an acute angle, whereby the column becomes a cone; now every cross section will
