In borrowing from the Hellenes, the Romans made little use of the Doric order. When it is used, as in the form of engaged columns in the =Theatre of Marcellus=, the height of the columns was increased in proportion to their diameters; the shafts were either smooth or channelled with semicircular, instead of the subtler, elliptic flutings, separated by narrow fillets; a base was added and modifications were made in the details of the capital. The architrave did not overhang the face of the column and was reduced in height; the triglyphs were used in the frieze only over the centre of the columns, even at the angles, while the cornice was lighter, with dentils sometimes taking the place of mutules. The Doric, in fact, did not appeal to the Roman taste for rich decoration, and, in so far as it was used, was degraded in style. The same is true of the Roman adaptation of the Ionic order. Simpler and more commonplace curves replace the extreme refinement of the volutes and the fillet of the latter was carried invariably across the top of the echinus or cushion, while the ornamentation of the entablature was more profuse. The best use of this order is found in the upper story of the =Theatre of Marcellus=; the worst, on the eight remaining columns of the =Temple of Saturn= in the Forum Romanum. The Corinthian order, of which no type sufficiently definite to constitute an order had been evolved by the Greeks, was fully worked out by the Romans, with the assistance of Greek artists, and became the favourite expression of their taste for richness. The shaft was either smooth, as in the early example of the Pantheon (<small>B.C.</small> 27), or fluted as in the great temple of Castor and Pollux; the heights in these two cases being respectively 9¾ and 10 diameters. A special base was designed, consisting of tori, scotia, and fillets, resting on a square plinth. The inverted bell of the capital was surrounded by an upper and lower row of acanthus leaves, which differ from the Hellenic forms in being blunter at the tips. Above the rows of leaves projected the stalks, or “caulicolæ,” which terminated in spirals, both in the centre of each face and at the angles of the abacus. The four sides of the latter are concave and decorated in the centre with a rosette. In the more sumptuous examples further enrichment of ornament was added to the capital, while the capitals of the =Temple= of =Castor and Pollux= present a unique instance of the central spirals being interlaced.