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 the beginning of the performance. For this device, something analogous to which had almost certainly already been used at Ferrara, there was a precedent in the classical aulaeum. Its object was apparently to give the audience a sudden vision of the scene, and it was not raised again during the action of the play, and had therefore no strictly scenic function.

The sixteenth-century prospettiva, of which there were many later examples, is the type of scenery so fully described and illustrated by the architect Sebastiano Serlio in the Second Book of his Architettura (1551). Serlio had himself been the designer of a theatre at Vicenza, and had also been familiar at Rome with Baldassarre Peruzzi, whose notes had passed into his possession. He was therefore well in the movement. At the time of the publication of the Architettura he was resident in France, where he was employed, like other Italians, by Francis I upon the palace of Fontainebleau. Extracts from Serlio's treatise will be found in an appendix and I need therefore only briefly summarize here the system of staging which it sets out. This is a combination of the more or less solid 'case' with flat cloths painted in perspective. The proscenium is long and comparatively shallow, with an entrance at each end, and flat. But from the line of the scena wall the level of the stage slopes slightly upwards and backwards, and on this slope stand to right and left the 'case' of boards or laths covered with canvas, while in the centre is a large aperture, disclosing a space across which the flat cloths are drawn, a large one at the back and smaller ones on frames projecting by increasing degrees from behind the 'case'. Out of these elements is constructed, by the art of perspective, a consistent scene with architectural perspectives facing the audience, and broken in the centre by a symmetrical vista. For the sake of variety, the action can use practicable doors and windows in the façades, and to some extent also within the central aperture, on the lower part of the slope. It was possible to arrange for interior action by discovering