The only instance, observed by the writer, of the occurrence of these “bacini” of glazed ware in domestic architecture is seen over the windows of the palazzo Fava in Bologna. This style of decoration ceased entirely during the course of the fourteenth century. Passeri instances the use of glaze on tiles upon a tomb in Bologna, opposite the church of S. Domenico, dated about 1100; and he further states, but we know not upon what authority, that it was about the year 1300 that the method of covering the clay with a “slip” or “engobe” of white earth, or the coarser earth of Verona, was first adopted. Slightly baked, it was glazed with “marzacotto” (oxide of lead and glass), applied wet and again fired; and this glaze was variously coloured yellow, green, black, and blue, by iron, copper, manganese, and cobalt. A similar method of coating the rough and porous baked clay seems to have been known also at a very early period in the north of Europe, and to have been in use throughout France, Germany, and England. CHAPTER II. ENAMELLED OR STANNIFEROUS GLAZED WARES. It was found that by the addition of a certain portion of the oxide of tin to the composition of glass and oxide of lead the character of the glaze entirely alters. Instead of being translucent it becomes, on fusion, an opaque and beautifully white enamel, the intervening process of covering the surface of the clay with a stratum of white earth before glazing being unnecessary. It, moreover, was found to afford a better ground for the application of coloured ornament. The process of application was the same as for the “slip;” after immersion in the enamel bath, and subsequent drying, the painting is applied upon the absorbent surface; the piece being then subjected to the fire which, at one application, fixes the colours and liquifies the glaze. This “enamelled” pottery (_émaillée_) is by far the more important group of the glazed wares, being susceptible of decoration by the lustre pigments, as well as by painting in colours of great delicacy; and it comprises the Hispano-moresque, the real Maiolica, and the perfected earthenware of Italy and other countries.