with thoughts of flowing leafage and fiery life, he gives those thoughts expression for an instant, and then withdraws within those massy bars and level cusps of stone.[11] [Illustration: PLATE VIII.--(Page 95--Vol. V.) WINDOW FROM THE CA' FOSCARI, VENICE.] And his power to do this depended altogether on his retaining the forms of the shadows in his sight. Far from carrying the eye to the ornaments, upon the stone, he abandoned these latter one by one; and while his mouldings received the most shapely order and symmetry, closely correspondent with that of the Rouen tracery, compare Plates III. and VIII., he kept the cusps within them perfectly flat, decorated, if at all, with a trefoil (Palazzo Foscari), or fillet (Doge's Palace) just traceable and no more, so that the quatrefoil, cut as sharply through them as if it had been struck out by a stamp, told upon the eye, with all its four black leaves, miles away. No knots of flowerwork, no ornaments of any kind, were suffered to interfere with the purity of its form: the cusp is usually quite sharp; but slightly truncated in the Palazzo Foscari, and charged with a simple ball in that of the Doge; and the glass of the window, where there was any, was, as we have seen, thrown back behind the stone-work, that no flashes of light might interfere with its depth. Corrupted forms, like those of the Casa d'Oro and Palazzo Pisani, and several others, only serve to show the majesty of the common design. XXII. Such are the principal circumstances traceable in the treatment of the two kinds of masses of light and darkness, in the hands of the earlier architects; gradation in the one, flatness in the other, and breadth in both, being the qualities sought and exhibited by every possible expedient, up to the period when, as we have before stated, the line was substituted for the mass, as the means of division of surface. Enough has been said to illustrate this, as regards tracery; but a word or two is still necessary respecting the mouldings.