At the head of the list stands the Hypostyle Hall, and next to it practically is the Parthenon, which being the only wooden-roofed building in the list, its ratio of support in proportion to the work required is nearly as great as that of the Temple at Karnac. Spires only wants better details to be one of the grandest edifices in Europe, and Bourges, Paris, Chartres, and Salisbury are among the most satisfactory Gothic cathedrals we possess. St. Ouen, notwithstanding all its beauty of detail and design, fails in this one point, and is certainly deficient in solidity. Cologne and Milan would both be very much improved by greater massiveness: and at York the lightness of the supports is carried so far that it never can be completed with the vaulted roof originally designed, for the nave at least. The four great Renaissance cathedrals, at Rome, Florence, London, and Paris, enumerated in this list, have quite sufficient strength for architectural effect, but the value of this is lost from concealed construction, and because the supports are generally grouped into a few great masses, the dimensions of which cannot be estimated by the eye. A Gothic architect would have divided these masses into twice or three times the number of the piers used in these churches, and by employing ornament designed to display and accentuate the construction, would have rendered these buildings far more satisfactory than they are. In this respect the great art of the architect consists in obtaining the greatest possible amount of unencumbered space internally, consistent in the first place with the requisite amount of permanent mechanical stability, and next with such an appearance of superfluity of strength as shall satisfy the mind that the building is perfectly secure and calculated to last for ages. IX.—FORMS.