Perhaps the most beautiful example is the fine picture by Annibale Carracci of "Christ appearing to Peter." This admirable work of art as nearly as possible contains the proportions of a carte-de-visite or whole-plate picture enlarged, and is well worthy the careful attention and study of every photographer; not only for its proportions and the amount of landscape background introduced, showing the proper position of the horizon and the small amount of sky visible, but it is a wonderful example of light and shade, foreshortening, variety and contrast of expression, purity of colour, simplicity of design, and truthfulness to nature. Neither of the figures lose any of their force or dignity, although the horizontal line is as high as their heads, and the whole of the space between is filled in with the scene around them. In its linear perspective it is quite in keeping with the figures, and the scenery is in harmonious subjection, controlled and subdued by aerial perspective. The large picture of "Erminia takes refuge with the Shepherds," by the same artist, is also a fine example of a horizon high in the picture. The figure of Erminia is separated from the other figures, and could be copied or reproduced alone without any loss of beauty and dignity, or any violation of natural laws. Murillo's picture of "St. John and the Lamb" suggests an admirable background for the use of the photographer. It consists of dark masses of rock and foliage. Nothing distinct or painfully visible, the distant masses of foliage blend with the clouds, and there is nothing in the background but masses of light and shade to support or relieve the principal objects. In the picture of "Christ appearing to Mary Magdalene," by Titian, the water-line is above the head of Christ, but if the figure were standing upright, the head of the Saviour would break the horizontal line. Titian's "Bacchus and Ariadne" also has the water-line breast high, almost to the neck of Ariadne. The figure of Bacchus springing from the car, as a matter of course, is much higher in the sky. This picture presents the perspective conditions of the painter having been seated while painting such figures from nature, or similar to the results and effects obtained by taking a group with the lens on a level with the breast or lower part of the necks of figures standing. In Titian's portrait of Ariosto there is a dark foliated background which gives great brilliancy to the picture, but no sky is visible. The "Portrait of a Lady," by Paris Bardone, has an architectural background in which no sky is to be seen. The picture is very brilliant, and the monotony of a plain background is skilfully overcome. The picture of "St. Catharine of Alexandria," by Raphael, has a landscape background, with the horizon about as high as the breast, as if the artist had been seated and the model standing during the process of painting.