But like all true artists the Intarsiatore did not stand still. Having successfully accomplished simple outline and accurate drawing, he was dissatisfied until he could carry his art farther by introducing the refinement of shading. This was done at different times and by different artists in a variety of ways; either by inlaying the shadow in different kinds of woods, by scorching it with fire, or by staining it with chemical solutions. In the book desks of the choir at the Certosa or Charterhouse of Pavia, the effect of shading is got in a direct but somewhat imperfect way by laying strips of different coloured woods side by side. Each flower or leaf was probably built up of tolerably thick pieces of wood glued together in position, so that they could be sliced off in veneers and yield several flowers or leaves from the same block, much in the way of Tunbridge Wells ware, though the Italian specimens are, I believe, always cut with the grain and not across it. The designs thus produced are very effective at a short distance, but the method is, of course, suitable only to bold and simple conventional patterns.
The panels of the high screen or back to the stalls at the same church afford an instance of a more elaborate method. These splendid panels, which go all round the choir, contain each a three-quarter-length figure of a saint. Lanzi deservedly praises them as the largest and most perfect figures of tarsia which he had seen. They date from 1486, and were executed by an Istrian artist, Bartolommeo da Pola, perhaps from the designs of Borgognone. The method by which their highly pictorial effect is produced is a mixed one, the shading being partly inlaid with woods of different colours, and partly obtained by scorching the wood with fire or hot sand in the manner generally in use for marqueterie at the present day. The inexhaustible patience as well as the fertility of resource displayed by Messer Bartolommeo is astonishing. Where the saw-cut did not give him a strong enough line he has inlaid a firm line of black wood, the high lights of the draperies are inlaid in white, the folds shaded by burning, and the flowing lines of the curling hair are all inlaid, each several tress being shaded by three narrow strips of gradated colour following the curved lines of the lock to which they belong. When it is remembered that there are some forty or more of these panels, each differing from the rest, the splendour as well as the laborious nature of the decoration of this unrivalled choir will be better understood.
Of all the examples of pictorial Intarsia the most elaborate are perhaps those in the choir stalls of Sta. Maria Maggiore in Bergamo. They are attributed to Gianfrancesco Capo di Ferro, who worked from the designs of Lotto, and was either a rival or pupil of Fra Damiano di Bergamo, a famous master of the art. They consist of figure subjects and landscapes on a small scale, shaded with all the delicacy and roundness attainable in a tinted drawing, and certainly show how near Intarsia can approach to painting. Their drawing is excellent and their execution marvellous; but at the same time one feels that, however one may admire them as a tour de force, the limitations of good sense and proper use of the material have been reached and overstepped. When the delicacy of the work is so great that it requires to be covered up or kept under glass, it obviously quits the province of decorative art; furniture is meant to be used, and when it is too precious to be usable on account of the over-delicate ornament bestowed upon it, it must be admitted that the ornament is out of place, and, therefore, bad art.
The later Italian Intarsia was betrayed into extravagance by the dexterity of the craftsman. The temptation before which he fell was that of rivalling the painter, and as he advanced in facility of technique, and found wider resources at his command, he threw aside not only those restraints which necessity had hitherto imposed, but also those which good taste and judgment still called him to obey. In the plain unshaded arabesques of the Sala del Cambio, and even in the figure panels of the Certosa, the treatment is purely decorative; the idea of a plane surface is rightly observed, and there is no attempt to represent distance or to produce illusory effects of relief. Above all, the work is solid and simple enough to bear handling; the stalls may be sat in, the desks may be used for books, the doors may be opened and shut, without fear of injury to their decoration. Working within these limits, the art was safe; but they came in time to be disregarded, and in this, as in other branches of art, the style was ruined by the over-ingenuity of the artists. Conscious of their own dexterity, they attempted things never done before, with means quite unsuited to the purpose, and with the sole result that they did imperfectly and laboriously with their wooden veneers, their glue-pot, and their chemicals, what the painter did with crayon and brush perfectly and easily. Their greatest triumphs after they began to run riot in this way, however interesting as miracles of dexterity, have no value as works of art in the eyes of those who know the true principles of decorative design; while nothing can be much duller than the elaborate playfulness of the Intarsiatore who loved to cover his panelling with sham book-cases, birds in cages, guitars, and military instruments in elaborate perspective.
It would take too long to say much about the art in its application to furniture, such as tables, chairs, cabinets, and other movables, which are decorated with inlay that generally goes by the French name of marqueterie. Marqueterie and Intarsia are the same thing, though from habit the French title is generally used when speaking of work on a smaller scale. And as the methods and materials are the same, whether used on a grand or a small scale, so the same rules and restraints apply to both classes of design, and can no more be infringed with impunity on the door of a tall clock-case than on the doors of a palatial hall of audience. Nothing can be a prettier or more practical and durable mode of decorating furniture than marqueterie in simple brown, black, yellow, and white; and when used with judgment there is nothing to forbid the employment of dyed woods; while the smallness of the scale puts at our disposal ivory, mother-of-pearl, and tortoise-shell, materials which in larger works are naturally out of the question. Nothing, on the other hand, is more offensive to good taste than some of the overdone marqueterie of the French school of the last century, with its picture panels, and naturalesque figures, flowers, and foliage, straggling all over the surface, as if the article of furniture were merely a vehicle for the cleverness of the marqueterie cutter. Still worse is the modern work of the kind, whether English or foreign, of which so much that is hopelessly pretentious and vulgar is turned out nowadays, in which the aim of the designer seems to have been to cover the surface as thickly as he could with flowers and festoons of all conceivable colours, without any regard for the form of the thing he was decorating, the nature of the material he was using, or the graceful disposition and economy of the ornament he was contriving.
WOODS AND OTHER MATERIALS
The woods in ordinary use by cabinetmakers may be divided broadly into two classes, viz. those which by their strength, toughness, and other qualities are suitable for construction, and those which by reason of the beauty of their texture or grain, their rarity, or their costliness, have come to be used chiefly for decorative purposes—veneering or inlaying. There are certainly several woods which combine the qualities necessary for either purpose, as will be noticed later on. At present the above classification is sufficiently accurate for the purposes of this paper. The woods chiefly used in the construction of cabinet work and furniture are oak, walnut, mahogany, rosewood, satin-wood, cedar, plane, sycamore.
The oak has been made the standard by which to measure all other woods for the qualities of strength, toughness, and durability. There are said to be nearly fifty species of oak known, but the common English oak possesses these qualities in a far greater degree than any other wood. It is, however, very cross-grained and difficult to manage where delicate details are required, and its qualities recommend it to the carpenter rather than to the furniture-maker, who prefers the softer and straight-grained oak from Turkey or wainscot from Holland, which, in addition to being more easily worked and taking a higher finish, is not so liable to warp or split.