THE charming varieties of decoration in relief by means of modelled gesso and stucco which attained to such richness and beauty in the hands of Italian artists in the fourteenth and fifteenth centuries, are traceable to very early origins, and come down from Graeco-Roman and Roman times, and probably had a still earlier existence in the East, since decoration in raised gesso was long practised by the Persians and the Arabs, and plaster-work goes back to the ancient Egyptians, who also used gesso grounds for the painting and gilding of their mummy cases. Existing examples of Roman and Pompeian relief work belong mostly to the first century B.C., and are of the nature of architectural enrichments, being chiefly mural and ceiling decorations, worked in plaster and stucco, in situ. Many of these are very delicate and show the influence of Greek feeling in design and treatment, such, for instance, as those from the ceilings of the tombs on the Via Latina at Rome, which in their simple panelled treatment, enclosing groups of finely modelled figures seem to be the forerunners of the rich and delicate gesso relief work, stamped, or modelled with the brush, which the Italians used with such tact in the decoration of caskets, marriage coffers, and other furniture in the early renascence period. Mr. Millar in his comprehensive work on "Plastering" speaks of a very fine example of gesso work as existing in the old cathedral church at Coire, a box which is said to be as old as the ninth century. It is entirely covered with gesso, on which a design in relief has been roughly scrolled. The gesso has been polished so as to give the appearance of ivory, and he further says, "at the corners, where it has got chipped off, the ends of the linen can be seen which has evidently been put next the wood, as Cennino Cennini advises."

Cennino, indeed, in his very interesting "Trattato" (which was translated by Mrs. Merrifield in 1844, for the first time into English, and recently, more accurately and completely, by Mrs. Herringham) gives very full and ample accounts of the methods in use in his time in painting and the allied arts, and gives recipes, also, both for making and working gesso. He lays great stress on the care necessary in preparing grounds on wood both for painting and raised work, and in advocating the use of "linen cloth, old, fine, and white, and free from all grease," writes "take your best size, cut or tear large or small strips of this linen, soak these in the size, and spread them with your hands over the surface of the panel; remove the seams, and spread the strips out with the palms of the hands, and leave them to dry for two days." He further enjoined one to "remember it is best to use size when the weather is dry and windy. Size is stronger in the winter than in summer, and in winter gilding must be done in damp and rainy weather." Then—Chapter 115—he proceeds to describe the process of laying on the ground of gesso over the linen. His "gesso grosso" used for the ground, is burnt gypsum or what we know as plaster of paris. The same, well-slaked, he uses for finer grounds, and also for working in relief upon such grounds.

In Chapter 116 Cennino describes how to prepare gesso sottile (slaked plaster of paris). The plaster, he says, "must be well purified, and kept moist in a large tub for at least a month; renew the water every day until it (the plaster) almost rots, and is completely slaked, and all fiery heat goes out of it, and it becomes as soft as silk." This gesso is afterwards dried in cakes and Cennino speaks of it in this form as "sold by the druggists to our painters," and that "it is used for grounding, for gilding, for working in relief, and other fine works." These cakes were scraped or soaked and ground to powder and mixed with size for using as grounds and for relief work, as occasion required (Chapters 117, 119). In speaking further on (Chapter 124) of "how works in relief are executed on panels with gesso sottile," he says, "take a little of the gesso on the point of the brush (the brush must be of minever, and the hairs fine and rather long), and with that quickly raise whatever figures you wish to make in relief; and if you raise any foliage, draw the design previously, like the figures, and be careful not to relieve too many things, or confusedly, for the clearer you make your foliage ornaments, the better you will be able to display the ingraining with stamps and they can be better burnished with the stone." He describes (Chapter 125) also methods of casting relief work, "to adorn some parts of the picture" which shows he is thinking of gesso enrichments in painting, so much used by the early painters.

Cennino is said to have been living in Padua in the year 1398. His treatise shows the care and patience necessary to good workmanship in the various arts and crafts he describes, and throws much light upon the methods of the artist craftsman of his time, and is of particular value and interest as touching the subjects of tempera painting, gilding, and, incidentally, of gesso-relief decoration, to the ornamental effect of which both the former are important contributors. Now there are several distinct varieties of gesso work. Firstly we have gesso relief used to adorn and enrich painted panels, or as an adjunct to decorative painting. Of this there are many instances: a notable one may be cited in the frescoes of Pinturrichio in the Appartamenti Borgia in the Vatican
at Rome where the paintings are heightened by gilded parts in relief, such as weapons and ornaments, embroidery or robes, and even architectural mouldings. The late Mr. Spencer Stanhope revived this union of gilded gesso with decorative painting, as in his work in the chapel at Marlborough College. Other examples may be found in our National Gallery. The superb collection of Italian gesso work in the Victoria and Albert Museum, unrivalled anywhere, from which, by the courtesy of the late Mr. Skinner, who was Sir C. Purdon Clarke's successor in the directorship,⁹ I am enabled to give my illustrations, may be referred to as furnishing examples of every variety of treatment in the craft, as well as of the taste and invention and richness of early Italian decorative design.

As an adjunct to painting gilded gesso was frequently used burnished and enriched with stamped or punctured patterns (granare), often in the form of nimbi around the heads of saints and angels in devotional works, and in backgrounds. Cennino (Chapter 142) speaks of this method and gives directions in it. The Marriage Coffer from the Museum, No. 5804—1859, illustrates this treatment and is a good example of its highly decorative effect. The front panel shows a very rich and interesting design of figures in fifteenth century Florentine costume, heightened with gilded
parts in gesso having small punctured patterns upon it, which give sparkle and variety to the gold. This method seems to have been continued for several centuries in Florence. I have an alms-dish of early seventeenth century date, the centre of which is treated in this way with punctured or hollow pin-head patterns impressed upon a gilded gesso ground.

This method, it may be noted, has lately been revived by Mrs. Adrian Stokes in association with tempera painting.

Stamped work, again, mentioned by Cennino, is another distinct method in gesso decoration. Of this a very beautiful example is the early fourteenth-century Italian cassone (No. 317—1894). This cassone is decorated with figures of knights and ladies on horseback, in hawking and hunting array, each figure being silhouetted in clear profile in a separate square panel, in white, upon a black or a red ground, alternately. These spaces or panels are divided horizontally by bands of running ornament in relief, and, vertically by bands of thin wrought iron foliated at the edges which form protecting and strengthening bands for the chest. The stamps from which these figures were produced must have been most delicately cut. They are full of fine detail and charming in design. It is not quite clear how they could have been so cleanly stamped upon the ground, unless perhaps, the edges and outlines were carefully gone round
and cleared afterwards, or the paste in which they were stamped, perhaps being slow in setting and more or less elastic, might have allowed of their being stamped cleanly out of the material separately and applied to the gesso ground or the chest afterwards.¹⁰

In design these figures (on the cassone illustrated) are characterized by a certain graceful severity, almost Greek-like in its ornamental restraint, yet in the delicate invention and richness of the decorative details of the costumes and housings of the horses they are oriental in treatment.

It has often been said that human figures cannot be repeated with satisfactory decorative effect, but this cassone is surely a striking instance to the contrary, as the recurring effect of these delicately silhouetted and slightly formalized figures and horses is extremely refined and beautiful.

We might be able to discover examples of gesso decoration in which stamped work or moulded work was used for repeating parts, and freehand work for other parts. In the Museum examples the majority seem to have been worked directly with a free hand. There is a fine example of how
gesso lends itself to a bold heraldic treatment in the Museum collection (No. 3—1865), a tournament shield on which a griffin, sable, is emblazoned on a field, or. The sable griffin in bold relief is not only a fine heraldic beast, but is decoratively spaced and relieved upon the gold field, the richness of which is greatly enhanced by the fine raised diaper pattern worked all over it in effective ornamental contrast to the bolder relief and treatment of the charge. It is possible stamps may have been used for the diaper of the field. The work belongs to the second half of the fifteenth century and is from the Palazzo Guadagni, Florence.

One of the charms of gesso work in ornamental effect is the softened, floated, or half melted look given to the forms which take the lustre of gilding so agreeably. This character no doubt is given by the use of the brush in floating or dropping on the forms of the ornament. In No. 727—1884 of the Museum collection a particularly rich and dignified ornamental effect is produced by the contrasting allied elements of the figure reliefs in the large lozenge-shaped enclosures, with the rich gilded formal diaper of the heraldic sphinx, or human-headed lion, which, in close repetition, forms the diaper on the main field of the decoration. The raised work in this example has the softened molten or beaten character above spoken of. The marriage coffer (No. 718—1884) is an instance of purely ornamental treatment in raised
and gilded gesso on wood, consisting mainly of foliated scroll forms characteristic of the early Italian Renascence work, and here again the raised patterns have the soft rich look, as if the ornament had been squeezed or floated upon the surface of the wood, somewhat in the way in which confectioners squeeze sugar ornaments upon cakes. Sugar, by the way was an occasional ingredient in the preparation of gesso, as Cennino mentions.

No. 247—1894, is a marriage coffer of walnut which has a symmetrically and formally planned scheme of raised decoration in gesso upon its front which suggests an earlier ornamental origin than the actual date of its production, perhaps, given as the end of the fourteenth century, as it resembles in character the textile patterns of the thirteenth century or earlier. The treatment of the gesso relief work is peculiar, and it appears as if an extremely softened, even and almost flattened effect had been aimed at, without any special emphasis on particular parts.

The rich encrusted effect of another treatment of gesso decoration characteristic of later fifteenth century work is shown in the beautiful coffer, No. 58—1867, the painted shields of arms being in ornamental contrast. Here we have an instance of the use of painting to relieve gesso decoration, as distinct from the use of gesso work to enrich the effect in painting.

Gesso decoration was also finely and freely
used for small caskets and other objects and with delightful results, as the rich Museum collection again demonstrates.

The coffret, No. 9—1890, is an interesting instance of this adaptability of gesso and the extraordinary variety and richness of effect obtainable; almost emulating carved work in the bolder parts of its relief, and yet with a softness and richness of its own. The designs are singularly interesting and spirited, and the whole work fully deserves the encomium suggested by its motto (in Lombardic letters on the lid) "Onesta e bella."

In No. 5757—1859 we have another good example of gesso decoration on a small scale, and its rich ornate effect in a well-balanced distribution of ornament adapted to a circular form, showing the fine sense of scale and quantity in ornament which distinguishes Italian work of this period—the first half of the fifteenth century.

Finally, in my last example (No. 7830—1861), the panel of a coffer belonging to the early sixteenth century, we see another use and treatment of gesso—to soften and enrich the effect of woodcarving and to make a good surface for gilding. The figures here are carved in bold relief and overlaid with a coating of gesso.

All carved work to be gilded was treated in this way with gesso, which greatly softens the effect, giving a smooth surface for the gilding and increases its richness, especially when done over Armenian bole, which we may see was used under the gilding of these raised gesso ornaments generally—another method which is being revived with the general revival of the forgotten arts of design and handicraft in our own time.

Note.—With reference to the early use of gesso, the extremely interesting and remarkable recent discoveries of Prof. Flinders Petrie in Egypt in the shape of mummies of the Roman period of the first century A.D., in addition to the light they throw on antique portrait painting, show that gilded gesso enrichment over linen was freely used at that period, some of the masks being moulded, and the ornament apparently stamped, the toes of each mummy being modelled and gilded and burnished, and the wrappings relieved with gilded buttons of gesso.

9:  Before the appointment of Sir Cecil Smith.

10:  Cennino describes a method of cutting stamps in stone (Chapter 170) to be used as moulds for figures to be applied to the decoration of chests or coffers, but he speaks of beating tin into these moulds and forming the figures in this way, afterwards backing them or filling them in with gesso grosso, cutting them out and sticking them on the chest with glue, gilding them and adding colour and varnish.