Of mouldings with curved profiles there are only six distinct forms, though the individual character of these curves is subject to great variation in treatment. _Purpose_ As suggested, mouldings have a distinct purpose, are, in fact, functional features, and may be defined as Sheltering or Crowning, Bracketing or Supporting, and Binding. In any composition where they may be necessary these functions should be taken into consideration. The profiles should always be concise whether the character of the curve be refined or robust. In classic architecture the relative proportions of the mouldings to the other features are defined, and these proportions will be found useful in other than purely architectural design. _The Fillet_ Mouldings are divided from each other by narrow vertical bands or Fillets, the employment of which is universal. The Fillet in projection is equal to its height, and though strictly divisional in its employment, is shown in conjunction with the curved profiles to indicate relative proportion. _Sheltering Mouldings_ There are two mouldings of curved profile in each category, the Sheltering being the Cavetto and the Cyma Recta. _The Cavetto_ The Cavetto is the culminating moulding of the Italian Doric cornice, and is a concave curve, which may be the result of a quarter circle. The Cavetto profile is used in other positions, which would appear to challenge the previous statement, but reflection will confirm the contention. For instance, the vertical face of the Frieze in some instances terminates with a cavetto curve which, though surmounted by the cornice, is yet at the top of the frieze. The upper extremity of the column shaft is similarly treated, and, it may be urged, so is the lower, but this, though an exception to the rule, is at least an æsthetic necessity. The projection of the Cavetto is equal to the height of the curve, and the crowning Fillet may be from one-third to one-fourth the total height, preferably the latter. _Cyma Recta_ The other sheltering moulding, the Cyma Recta, is a curve of double flexure with upper fillet. Its proper employment is as the crowning member of the cornice, though, like the Cavetto, it is employed in other positions, notably as a plinth moulding, when it appears in a reversed position. The projection is about equal to the height of the curved profile, the height of the crowning fillet being from one-fourth to one-fifth of the whole. _Bracketing Mouldings_ The supporting mouldings are the Ovolo and the Cyma Reversa. _The Ovolo_ The Ovolo is composed of a full convex curve, either a quarter circle or slightly elliptic, which in height is equal to projection; and a fillet at base one-fifth the total height. Frequently this lower member is in the form of a half round bead of the same dimension as the fillet.