[Illustration: Fig. 198.--Roman Terra-cotta Lamps.] The different kinds of unglazed Roman ware may be divided, according to the color of their pastes, into yellowish white, red, gray, and black. The yellow paste was the coarsest, and was used for large pieces, such as the _dolia_ and _amphoræ_. The smaller pieces of this color are of a better quality. Many of the household vessels were of red ware, such as plates, bottles, and jars. Some of it, as, for example, the false Samian, was dipped in a slip. The gray class comprises _amphoræ_, and flat cooking-pans, and includes some specimens which have all the characteristics of modern stone-ware. The black paste was largely employed in making dishes and other table utensils, such as cups and candle-sticks. [Illustration: Fig. 199.--Roman Bowl of Samian Ware.] The leading kinds of glazed pottery were the Aretine and red Samian wares. The latter of these is the more celebrated (Fig. 199). Its prototype is to be found in the red ware of the Greek islands. The paste is close and fine, and the glaze is clear and very thin. The similarity in texture of all the specimens points to the conclusion that they were made in one place. The Samian ware has, like the legionary tiles, been found wherever the arms of Rome were carried. Like the unglazed red pottery, it was extensively used for table services, and may broadly be said to have been the chief domestic ware of the Romans. The ornamentation consists of mouldings in relief, incised rings, and intaglio patterns. The Aretine ware is also red, and is very like the Samian in many respects, but of a lighter shade, and more finely decorated, chiefly in relief. There are also two kinds of black Roman ware, one of dark paste, the other of red paste colored black. The ornamentation of the first is generally very simple, while that of the latter, in some cases, resembles the mouldings on red ware. Like the Samian, it is found over the greater part of Europe.