Many writers have appeared who deny the above mentioned statement of Vasari, and maintain that the art of painting in oil was known long before. It is pretended that it existed in the time of the Romans, an opinion that is adopted by Sig. Ranza, in regard to a picture _said to be of S. Helena_, consisting of a quilting of different pieces of silk stitched together, exhibiting a picture of the Virgin Saint with the Infant. The heads and hands are coloured in oils; the drapery is shaded with the needle, and in a great measure with the pencil. It is preserved in Vercelli, and from the tradition of its citizens reported by Mabillon (Diar. Ital. Cap. 28), it is said to be the work of S. Helena, mother of Constantine; that is, the patches of silk were sewed by her, and the gilding and painting added to it by her painter, as is conjectured by Ranza. He was not aware that the practice of drawing the Infant Christ in the lap of the Virgin (as we notice in the preface to the Roman school), was posterior to the fourth century; and that other particulars related by him of the picture cannot belong to the age of Constantine; for instance, the hooded mantle of our Lady. From such signs we ought rather to conclude that it is either not an oil painting, or that the figure, at whatever period executed, has been retouched in the same way as that of the Nunziata at Florence, or of the Santa Maria Primerana at Fiesole; the former of which in the drapery, and the latter in the lineaments, are not the same now as in their ancient state.