And, again, in the phrase totus, teres, atque rotundus^[3098] he is doubtless referring to a vase just turned off the wheel. Tibullus speaks of “slippery clay fashioned on the wheel of Cumae”^[3099]; and there are also allusions in Plautus and other writers.^[3100] The simile has also been drawn upon by English poets.^[3101] Specimens of potters’ wheels have been found at Arezzo and at Nancy; these are made of terracotta, pierced in the centre for the axis of the pivot, and furnished at the circumference with small cylinders of lead, to give purchase for the hand and steadiness to the whirling wheel.^[3102] Another from Lezoux, now in the Museum at Roanne, is figured by M. Déchelette.^[3103] Most of the common wares were made by this process, except the dolia, or large casks, which were built up on a frame like the Greek pithos (Vol. I. p. 152).

But for the ornamented vases with reliefs an additional process was necessary in order to produce the raised ornament, and they were in nearly all cases produced from moulds, like the lamps or terracotta figures and reliefs.^[3104] The vases were still fashioned on the wheel, but this was done in the mould from which the reliefs were obtained. Occasionally the reliefs were modelled by hand or with the aid of tools, or even produced with a brush full of thick slip (en barbotine), but moulding was the general rule. This method entailed three distinct stages, of which the first alone required artistic capacity; the other two were purely mechanical, requiring only a certain technical dexterity. The first was that of making the stamps from which the designs were impressed; the second, the making of the moulds; the third, impressing the clay in the mould.

The stamps were made of clay, gypsum, wood, or metal, and had a handle at the back for holding while pressing them into the mould; they were used not only for figures and ornamental designs, but also for the potter’s signature (see below). Only clay examples, however, have been preserved, but some of these are admirable specimens. Frequently the subjects on the Arretine vases were taken, like those on lamps and mural reliefs, from existing works of art, especially from the “new Attic” reliefs to which allusion has already been made (p. 368), and the stamps are directly copied from these sources. An instance of this is a stamp from Arezzo in the British Museum, with a beautiful figure of Spring (Plate LXVI. fig. 2), which finds its counterpart on a complete vase from Capua (Fig. 219), and also on a mural relief (B.M. D 583). Another good example in the same collection represents a slave bending over a vessel on a fire, and shielding his face from the heat with one hand. From the same site are two others representing respectively a boar and a lion. A fourth stamp found at Arezzo, with a tragic mask, is given in Fig. 211.^[3105] The stamps must have been articles of commerce, and handed down from one potter to another, as the subjects are found repeated in different places; the majority were probably made at Arezzo and other important places in Italy.

Among examples from the provinces may be mentioned one in the British Museum (Romano-British collection), with the figure of a youth, inscribed OFFI(cina) LIBERTI; it is of fine terracotta, and was found at Mainz. A stamp with the figure of Paris or Atys is in the museum of the Philosophical Society at York.^[3106] Other stamps in the form of a hare and a lion in the Sèvres Museum are inscribed with the name of Cerialis, a well-known German potter, whose name also occurs on a mould for a large bowl with a frieze of combatants in the British Museum, and in the former museum are six others, including one of a wolf, with the name of a Gaulish potter, Cobnertus.^[3107] Von Hefner mentions one found at Rheinzabern with a figure of a gladiator at each end, inscribed P · ATTI · CLINI · O(fficina), and others from Westerndorf with a lion and a horse.^[3108] Dies for stamping the potters’ names have been found at Lezoux in Auvergne, and in Luxemburg, with the names of Auster (AVSTRI · OF) and Cobnertus, and Roach-Smith possessed one with the latter name^[3109]; in the Sèvres Museum is also a stamp for making rows of pattern (see below),^[3110] and at Rheinzabern one for an egg-and-tongue moulding was found.^[3111] Specimens of these stamps are given in Fig. 211.

The moulds were made of a somewhat lighter clay than that of the vases, but it was essential that the material should be sufficiently porous to absorb the moisture of the pressed-in clay of the vase; sometimes holes for the water to escape through are visible. They were made on the wheel, and had a ridge on the exterior for convenience in handling; they were made whole, not in halves, but sometimes the vase was first made plain, and the figures were then attached from separate moulds, or rather made separately, as in the case of the “Megarian” bowls (Vol. I. p. 499).^[3112] Vases have been found in the Rhone valley ornamented with large appliqué medallions, and the separate moulds for these also exist; they seem to have been made at Vienne.^[3113] The figures and ornaments were impressed into the moulds from the stamps while the paste was still soft, leaving hollow impressions to receive the clay of the vases. Similarly, continuous patterns, such as rows of beads or dots, were traced in the mould with a roller or wheel-like instrument on which the pattern was cut in relief.^[3114] Any defects or careless arrangement in the completed vase would of course be due to a careless insertion of the stamps in the mould.

There are large numbers of moulds for Roman and provincial vases in existence,^[3115] and the British Museum has a fine though fragmentary series from Arezzo, intended for some of the finest specimens of the local ware; of these more will be said in the following chapter. Many of these moulds have been found on sites of potteries in Gaul, especially in the Auvergne and Bourbonnais districts, and are collected in the Moulins, Roanne, St. Germain, and other museums. Lezoux was an important centre in this respect, and here also were found moulds for patterns and ornaments.^[3116] In the British Museum (Romano-British collection) there is part of a mould for a shallow bowl, found at Rheinzabern, with stamped designs of a lion, boar, and hare pursuing one another; it is similar to the mould with Cerialis’ name already described. These matrices are usually of fine bright red clay, unglazed; they are very porous, rapidly absorbing moisture, and easily allowing the potter to withdraw the vessel from the mould. The importance of the discovery of moulds can hardly be overrated for the evidence they afford as to the site of potteries and centres of fabrics^[3117]; it is obvious that where they are found, and only in such places, the vases must have been made; and that the discovery of a potter’s name on any mould establishes his workshop at the place where it was found. Various tools for working the moulds, or touching up details or damaged parts of bronze and ivory, have been found on the sites of ancient potteries,^[3118] as at Arezzo, but their use cannot be accurately determined.

The method of decoration known as en barbotine, which is a sort of cross between painting and relief, was achieved by the laying on of a semi-liquid clay slip with a brush, a spatula, or a small tube. The pattern was probably first lightly indicated, and the viscous paste was then laid on in thick lines or masses, producing a sort of low relief. The process was, as a rule, only employed for simple ornamentation, such as leaves, sprays, and garlands; but on the provincial black wares it finds a freer scope. On vases found in Britain and the adjoining parts of the Continent (p. 544) figures of animals are rendered in this manner, and on another class peculiar to Germany (p. 537) inscriptions are painted in a thick white slip. The colour of the slip did not necessarily correspond to the clay of the vase, and was, in fact, usually white. These vases are, however, technically poor, and the reliefs heavy and irregular. The process has been aptly compared to the sugar ornamentation on cakes.^[3119]

Painted decoration is almost unknown in Roman pottery, and is, in fact, confined to the POCOLOM series described in Chapter XI. It occurs in a rough and primitive form on some of the provincial fabrics, such as the Castor and Rhenish vases (see pp. 537, 544), but its place is really taken by the barbotine method.

Engraved or incised decoration is exceedingly rare, and practically confined to provincial wares, which sometimes have incisions or undulations made over the surface with the fingernail in the moist clay.^[3120] In the north of England, as at York, pottery is commonly found with wreaths and fan-patterns cut in intaglio in the clay while moist. Others have patterns of four leaves 2019four-leaf cut in the soft clay, or continuous ornaments round the vase made with the toothed roller-like instrument of which we have already spoken. Some of this ornamentation may be in imitation of contemporary glass vases. M. Déchelette has traced this fabric to Lezoux,^[3121] and the specimens found in Britain are doubtless imported. A Gaulish example from the Morel Collection in the British Museum is given on Plate LXIX. fig. 4.

The feet and rims of the vases were made separately, and attached after their removal from the wheel, as were also the handles when required; but the rarity of handles in Roman pottery is remarkable. It is perhaps due to the difficulty of packing them safely for export. The next process was the preparation of the glaze, for those vases to which it was applied, followed by the baking.

3. Roman Pottery-Furnaces

The remains of pottery-kilns and furnaces discovered in various parts of Europe have furnished a considerable amount of valuable information on the system employed in baking the vases. On this particular point, indeed, we know far more in regard to Roman pottery than to Greek, although, as we have seen in Chapter V., the painted vases themselves sometimes yield information on the appearance and arrangement of the furnaces. But remains of actual furnaces have been found in many places in Western Europe, notably in Germany, France, and Britain, in a more or less complete state, as also in Italy, at Pompeii, Modena, and Marzabotto.^[3122] A complete list of those known in 1863 has been given by Von Hefner,^[3123] supplemented by Blanchet’s lists of furnaces found in France (1898 and 1902).^[3124] In Gaul the best examples are at Lezoux, near Clermont, at Châtelet in Haute-Marne,^[3125] and at Belle-Vue, near Agen, in the Department of Lot-et-Garonne.^[3126] The latter was circular in form, below the level of the soil. In Germany important remains have been found at Heiligenberg in Baden, Heddernheim near Frankfort, Rheinzabern near Karlsruhe, and Westerndorf.^[3127] All these in general arrangement differ little from those in use at the present day; the Heddernheim furnace (Fig. 212) was found in the most perfect preservation, but was subsequently destroyed, not, however, before satisfactory plans and drawings had been made.^[3128] In Britain by far the most important discoveries have been made at Castor, Chesterton, and Wansford in Northants, where the remains extend for some distance along the Nene valley.^[3129] They were first explored by Artis in 1821-27, who published a magnificent series of plates in illustration, entitled Durobrivae; these he supplemented by a full description in the Journal of the British Archaeological Association.^[3130] Castor and Chesterton (the latter in Hunts) are both on the site of Roman towns, and were the centres of a special local ware, described in a succeeding chapter. The potteries, being so numerous, are probably not all of the same age.

In 1677 four Roman kilns were discovered in digging under St. Paul’s Cathedral for the foundation of Sir C. Wren’s building, at a depth of 26 feet. They were made of loam, which had been converted into brick by the action of the fires, and were full of coarse pots and dishes; they measured 5 feet each way. A drawing made at the time is preserved among the Sloane MSS. in the British Museum.^[3131] In the kilns was found pottery of the kind typical of London and the neighbourhood. In 1898 two kilns, one of large size, with pottery bearing the name CASTVS FECIT, were found near Radlett in Herts,^[3132] and another was excavated in 1895 by Mr. C. H. Read at Shoeburyness.^[3133] In Norfolk a kiln of somewhat curious form was found in the Roman settlement of Caistor by Norwich; the shape is that of a shallow concave depression with partitions, and it contained vases placed ready for baking.^[3134] Another found between Buxton and Brampton was recorded by Sir Thomas Browne,^[3135] and a third at Weybourne.^[3136] In the South of England kilns have been found in the New Forest, where there was a manufacture of local pottery^[3137]; in Alice Holt Forest near Petersfield, Hants; at Shepton Mallet in Somerset; and a potter’s workshop at Milton Abbas, Dorset.^[3138] The British Museum contains a model of a kiln unearthed at Worcester about forty years ago, on the site of the modern porcelain works. Finally, discoveries of kilns and pottery were made in 1819 at Colchester, and again in 1878, when five kilns, all of different forms, with local pottery, came to light.^[3139]

To describe all these different types of furnaces in detail would of course be impossible, but much may be learnt from the very full, though now somewhat antiquated, descriptions of the Castor kilns given by Artis.^[3140] It will be found more satisfactory to describe the generally-prevailing arrangements, noting the more important variations where they occur. It may further be laid down that the system was practically the same for terracotta figures and tiles as for pottery, and that in many cases both were made in the same furnace. But this was not invariably the case, and at Rheinzabern, for instance, the kilns for tiles were quadrangular, those for pottery circular.

The kilns were constructed partly of burnt, partly of unburnt brick, the interior, floor, and outside of the roofs being covered with a strong layer of cement. They consisted of two main portions, the fire-chamber with its adjuncts, and the vaulted chamber above, in which the objects to be baked are placed. The fire-chamber was usually circular, with a projection in front, the praefurnium^[3141] which had either a vaulted roof, as at Castor and Heiligenberg, or a gabled roof formed of pairs of tiles, as at Rheinzabern. Through this the fuel was introduced, consisting chiefly, as charcoal remains show, of pine-wood. The fire-chamber was either divided up, as at Castor, by walls radiating from a central pillar which supported the roof, or by rows of pillars in a line with the entrance, as at Rheinzabern and Heiligenberg. Holes were bored in the roof to allow the heat to penetrate through, but the arrangement varies; at Heiligenberg each division of the furnace was vaulted, making grooves along which the holes were bored. The oven where the pots were placed has been destroyed in most cases, but we know that it consisted of a floor, a wall with entrances, and a vaulted dome. The pots were ranged partly on the floor, partly on terracotta stands over the holes, as at Rheinzabern and Heiligenberg^[3142]; at Lezoux there are remains of holes in the walls for iron bars to support them. Special arrangements seem to have been made for baking the finer wares, in order to ensure the proper spread of heat, and to guard against their being blackened or otherwise injured. In the Romano-British Room of the British Museum is a lump of bowls of red ware from Lezoux, fused together in the baking and cast aside.^[3143]

One of the kilns at Castor (Fig. 213) is described by Artis as a circular hole 3 to 4 feet deep and 4 feet in diameter, walled round to a height of 2 feet; the praefurnium was about a foot in length. In the centre of the circular hole was an oval pedestal (with one end pointing to the furnace-mouth), on which and on the side wall the floor was supported, being formed of perforated angular bricks meeting in the centre. The vaulted dome was composed of bricks moulded for the purpose,^[3144] and the sides of the kiln of curved bricks set edgeways in a thick slip of the same material. Brongniart^[3145] compares the Castor kiln with that at Heiligenberg, near Strasburg, and others in the Rhine valley in which “Samian” ware was made.

Another kiln found in 1844 Artis describes as having been “used for firing the common blue or slate-coloured pottery, and had been built on part of the site of one of the same kind, and within a yard and a half of one that had been constructed for firing pottery of a different description. The older exhausted kiln ... presented the appearance of very early work; the bricks had evidently been modelled with the hand, and not moulded, and the workmanship was altogether inferior to that of the others, which were also in a very mutilated state; but the character of the work, the bricks, the mouths of the furnaces, and the oval pedestals which supported the floors of the kilns, were still apparent.”

Artis was also of opinion that “the blue and slate-coloured vessels found here in such abundance were coloured by suffocating the fire of the kiln, at a time when its contents had acquired a degree of heat sufficient to ensure uniformity of colour.” Hence he denominated kilns in which this ware was baked, “smother kilns.” He further notes that the bricks of this kiln “were made of clay mixed with rye in the chaff, which being consumed by the fire [i.e. in the baking of the bricks] left cavities in the room of the grains, which might have been intended to modify expansion and contraction, as well as to assist the gradual distribution of the colouring vapour. The mouth of the furnace and top of the kiln were no doubt stopped; thus every part of the kiln was penetrated with the colouring exhalation.” From experiments made on the local clays he proved to his own satisfaction that the colour could not have been produced by any metallic oxide, inherent or applied from without; and this view was supported by the appearance of the clay wrappers of the dome of the kiln. But in view of recent researches, such as those of Blümner, it is doubtful whether Artis’ theories can now be upheld. As Mr. Haverfield has pointed out,^[3146] the dark colour may be due to the chemical action of the carbonaceous vapour of the smothered kiln rather than to any “colouring exhalation.”

The process of packing the kiln in order to secure uniform heat in firing is thus described by the same writer: “The kilns were first carefully loose-packed with the articles to be fired, up to the height of the side walls. The circumference of the bulk was then gradually diminished, and finished in the shape of a dome. As this arrangement progressed, an attendant seems to have followed the packer, and thinly covered a layer of pots with coarse hay or grass. He then took some thin clay, the size of his hand, and laid it flat on the grass upon the vessels; he then placed more grass on the edge of the clay just laid on, and then more clay, and so on until he had completed the circle. By this time the packer would have raised another tier of pots, the plasterer following as before, hanging the grass over the top edge of the last layer of plaster, until he had reached the top, in which a small aperture was left, and the clay nipt round the edge; another coating would be laid on as before described. Gravel or loam was then thrown up against the side wall where the clay wrappers were commenced, probably to secure the bricks and the clay coating. In consequence of the care taken to place grass between the edges of the wrappers, they could be unpacked in the same-sized pieces as when laid on in a plastic state, and thus the danger in breaking the coat to obtain the contents of the kiln could be obviated.”

In the course of his excavations Artis discovered a singular furnace,^[3147] “of which I have never before or since met with an example. Over it had been placed two circular earthen fire vessels (or cauldrons); that next above the furnace was a third less than the other, which would hold about eight gallons. The fire passed partly under both of them, the smoke escaping by a smoothly-plastered flue, from seven to eight inches wide. The vessels were suspended by the rims fitting into a circular groove or rabbet, formed for the purpose.” He was strongly of opinion that this furnace was used for producing glazed wares by means of iron oxide. Whether this is so or not, it is interesting to note that in the British Museum and Museum of Geology there are cakes of vitreous matter from Castor, probably used as a glaze, and consisting of silicates of soda and lime.^[3148]

The kiln found at Caistor, in Norfolk, was apparently used for baking the grey Roman ware, and differed in form from those described, which were for the black, being only calculated for a slight degree of baking. It was a regular oval, measuring 6 feet 4 inches in breadth. The furnace holes were filled in below with burnt earth of a red colour, and in the upper part with peat; the exterior was formed of strong blue clay of 6 inches in thickness, and the interior lined with peat; the kiln was intersected by partitions of blue clay. Some of the vases were inverted and filled with a core of white sand.^[3149]

The furnaces at Heiligenberg and Rheinzabern present the following further peculiarities.^[3150] The former, which were evidently used for the baking of red wares, had a flue in the form of a long channel with arched vault, the mouth being over 8 feet from the space where the flames and heat were concentrated under the oven (Fig. 214). Numerous pipes of terracotta, of varying diameter, diverged from the upper part or floor of the oven, to distribute the heat; in the outer wall of the oven was a series of smaller ones, and twelve or fifteen of larger size opened under the floor of the oven to distribute the heat and flame round the pots (Fig. 215). The mouths of the pipes were sometimes stopped with baked clay stoppers to moderate the heat. The upper part or dome of the kiln is never found entire, having been generally destroyed here, as elsewhere, by the superincumbent earth. Walls of strong masonry separated and protected the space between the mouth of the flue and the walls of the oven, and the floor of the latter was made of terracotta tiles.

At Rheinzabern, where excavations were made in 1858, fifteen furnaces were found, some round and others square, but all constructed on the same plan. The floor of the oven was over 3 feet below the top of the walls, and was covered with tiling, the walls being formed of rough slabs of clay, about 28 by 16 inches in size. The floors of the ovens were in some cases supported by bricks covered with a coating of clay. Stands of baked clay in the shape of flattened cylinders supported the pots in the oven, and these rested on pads of a peculiar form, roughly modelled in clay.^[3151] In all, seventy-seven pottery-kilns and thirty-six tile-kilns were discovered on this site.^[3152]

The following list, though by no means claiming to be exhaustive, gives the names of the chief potteries where actual furnaces have been discovered.

[See also Blanchet, p. 90 ff. for sites of furnaces for terracotta figures.]

[On the subject generally reference may be made to Brongniart, Traité, i. p. 426; De Caumont, Cours d’ant. Monum. ii. (for Heiligenberg); Von Hefner, Römische Topferei, in Oberbayr. Archiv für vaterl. Gesch. xxii. (1863), p. 60 (where a complete list of furnaces up to date is given); Bonner Jahrbücher, lxii. 1878, p. 7 ff.; Wolff in Westdeutsche Zeitschrift für Gesch. u. Kunst, xviii. (1899), p. 211 ff.; Blümner, Technologie, ii. p. 23 ff.; Smith, Dict. of Antiqs. i. p. 845 (art. Fictile); and for Gaulish sites, Blanchet, Mélanges Gallo-romaines, ii. p. 93 ff.]

4. Pottery in Latin Literature; Shapes and Uses

Vessels of earthenware were extensively used by the Roman people in the earlier days of the Republic for all purposes of domestic life,^[3153] and later writers often contrast their use with that of the costly vases of precious metal then customary. “Gold,” says Persius, “has driven away the vases of Numa and the brass vessels of Saturn, the urns of the Vestals and Etruscan earthenware”^[3154]; and Juvenal speaks of those who laughed at “Numa’s black dish and bowl, and fragile saucers from the Vatican hill.”^[3155] Even under the Empire fictile vases continued to be used by the poorer classes, and the use of the finer red glazed wares must have been even more general. But Juvenal, satirising the luxury of Domitian’s time, says that it is considered a reproach to dine off earthenware.^[3156] In Republican times it was the proud boast of a Curius to prefer his earthenware service to Samnite gold,^[3157] and in 167 B.C. the consul Q. Aclius Tubero was found by the Aetolian ambassador dining off earthenware^[3158]; Seneca also tells how he, at his entertainment given in the temple of Jupiter, placed fictile vessels before his guests.^[3159] But when Masinissa entertained the Romans in 148 B.C. the first course was served on silver, the second in golden baskets, which Ptolemy Euergetes describes respectively as the Roman and Italian fashions.^[3160] Athenaeus says that up to Macedonian times dinners were served in fictile vessels, but that subsequently the Romans became more luxurious, and Cleopatra spent five minae a day on gold and silver wares.^[3161] Subsequently earthenware was replaced by glass as well as metal, especially for unguent-bottles and drinking-cups, of which large numbers are found in Roman tombs, where they virtually take the place of pottery. Vases of immense size were sometimes made under the Empire, and stories are told of the absurdities perpetrated by some of the Emperors in this respect. Juvenal, in describing the turbot prepared for Domitian,^[3162] says no dish could be found of sufficient size to cook it in, and Vitellius had a dish made which from its huge dimensions acquired the name of “the shield of Minerva.”^[3163] Elsewhere it is scoffed at as a “swamp of dishes” (patinarum paludes).^[3164] Pliny speaks of terracotta vases which sold for even more than precious crystal or myrrhine ware,^[3165] and were therefore presumably of great size.

The principal use of earthenware was for the transport and storage of wine, oil, corn, figs, honey, and other commodities, answering to the casks of the present day. Martial speaks of a jar (testa) reddened with the blood of tunnies exported from Antipolis (Antibes).^[3166] Of the shapes used for this purpose and their names we shall speak presently in detail. Vases were also used in religious rites, but metal was probably more general; Plautus describes a miser who sacrificed to the Lares in earthenware (vasis Samiis) because he was afraid that they might steal silver vessels.^[3167] They were also used for various operations in agriculture, medicine, and household economy; but above all for the domestic purposes of the table. Some of the peculiar uses have already been referred to (p. 387), and another that may be mentioned is the use of jars as bell-glasses for rearing vine-sprouts.^[3168]

Although the custom of burying vases with the dead was not so general among the Romans as among the Greeks, they were yet frequently used in graves in the form of cinerary urns, in the shape of a covered jar (olla or obrendarium^[3169]) of coarse ware and globular in form (p. 550). Vases containing ashes have often been found in England, as at Bartlow and Litlington in Cambridgeshire.^[3170] At the latter place a tomb contained a sort of colander perforated with holes which formed the letters INDVLCIVS.^[3171] Similar finds are recorded from Arnaise in France. Pliny states that many persons expressed their desire to be buried in coffins of terracotta.^[3172] Roman sarcophagi of terracotta have been found at Saguntum in Spain, but for these stone and lead were the ordinary materials. The cinerary urns were often formed from large dolia or amphorae, the neck being broken off so as to produce a globular vessel. Examples have been found in England at Chesterford, Essex,^[3173] at Southfleet in Kent,^[3174] and in the Bedford Purlieus near Kingscliffe, Northants (now at Woburn Abbey); another is in the Cathedral Library at Lincoln.^[3175] Roach-Smith also mentions specimens found in Lothbury, London, and in Kent, the latter being now in the Maidstone Museum.^[3176]

Vitruvius, in his chapter on Echea, or vases distributed around the ancient theatres for acoustic purposes, mentions that they were often made of earthenware for economical reasons^[3177]; but they were usually of bronze. Seneca, too, alludes to this practice when he speaks of the voice of a singer falling upon a jar (dolium).^[3178] It is certain that the Greeks and Romans often made use of earthenware jars in architecture, but it is probable that this was more often done with the object of diminishing weight than for acoustic reasons, or, as some have thought, for want of better material. The dolium, amphora, and olla seem to have been the forms most usually employed. There are various examples in walls and substructures of the Augustan period, and they are also found in vaults, where their purpose is undoubtedly to lighten the weight.^[3179] In the circus of Maxentius a number of large amphorae were found embedded in the vaulting and upper part of the walls, arranged neck downwards and with their axis inclined obliquely to the wall.^[3180] All are now broken, but they illustrate the ingenious method in which the upper parts of the arches supporting the rows of seats were lightened. In the dome of the tomb of St. Helena, outside the Porta Labicana, rings of pots are embedded for the same purpose, whence the building is usually known as Torre Pignattara (from pignatte, pots).^[3181] An oven found at Pompeii had a vaulted top formed of ollae fitted into one another, each about a foot in height, of ordinary red ware; the span of the arch was 5 feet 6 inches, and the object here was to ensure extreme dryness as well as lightness.^[3182] A similar arrangement occurs in the Stabian Thermae at Pompeii, and also in the church of San Stefano alla Rotonda at Rome, and the dome of San Vitale at Ravenna, built by Justinian in the sixth century, is similarly constructed, with an elaborate system of tubes and jars.^[3183] The practice seems to have been continued during the Middle Ages, and an example occurs in England, at Fountains Abbey, where the purpose was acoustic.^[3184]

We now proceed to describe in detail the principal shapes of Roman vases, so far as they can be identified from literary or epigraphical evidence or from other sources, on the same lines as in our previous chapter on the shapes of Greek pottery. Some of these shapes, it will be seen, they had in common with the Greeks, such as the amphora, the krater, and the phiale or patera, and in several instances (such as the cyathus and the scyphus) the Greek name is preserved.

Beginning with vases used for storage, whether for liquids, as for wine and oil, or for solids, as for corn or fruit, which were chiefly kept in cellars, we take first the dolium, a gigantic cask corresponding to the Greek πίθος (Vol. I. p. 152), which from its general usage gave rise to the generic term opus doliare, for common work in clay. It was large enough to contain a man, as we know from the story of Diogenes illustrated on the Roman lamp already given (Plate LXIV. fig. 6); the vessel thereon depicted may serve to give an idea of its appearance. Columella^[3185] speaks of dolia sesquiculearia, i.e. holding one-and-a-half culei or thirty amphorae. They were buried in the earth of the cellars, and have been found thus in Italy at Anzi, in France at Apt, Vaucluse, and near Clermont, and at Tunis.^[3186] They were used for wine, oil, corn, and salted meat, and Juvenal tells us that dolia were used for new wine, being lined with wax, pitch, or gypsum.^[3187] In 1858 a large number were found at Sarno in Campania, some being stamped with the makers’ names, as ONESIMVS FECIT, VITALIS F, L · TITI · T · F · PAP, and M · LVCCEI · QVARTIONIS.^[3188] On one was incised L · XXXIV, or thirty-four lagenae (see p. 446). One of the prodigies which was supposed to predict the future fortune of the Emperor Antoninus Pius was the discovery above ground of some dolia which had been sunk in the earth in Etruria.^[3189] An old name for the dolium was calpar,^[3190] and another smaller variety was the seria,^[3191] containing only seven amphorae. A diminutive form of the latter, seriola, is described as a wine-vessel invented in Syria.^[3192]

Dolia were made in separate pieces, the base and other parts being secured by leaden cramps, and they were also hooped with lead, as we learn from Cato.^[3193] Pliny speaks of repairing casks by fitting on handles, scraping the hoops, and stopping up cracks.^[3194] They are made both of white and red clay, baked in a slow furnace, great care being required to moderate the heat aright. Their makers were known as doliarii. Part of a large dolium bound with leaden hoops was found near Modena, at Palzano; also at Spilamberto, one with the name of T. Gavelius and the numerals XXX, XIII, another of the capacity of 36 amphorae.^[3195] On the mouth of one found in the Villa Peretta at Rome was the name of L. Calpurnius Eros,^[3196] on another the name of T. Cocceius Fortunatus.^[3197] Two good examples of dolia were at one time preserved in the gardens of the Villa Albani, about 4 feet in diameter and as many in height, and of a coarse gritty pale red clay. This kind of vase was often used for sepulchral purposes, bodies having being found actually buried in them (see above, p. 457).

Next in size and importance to the dolium is the amphora, resembling in form the Greek wine-jar^[3198]; it usually has a long cylindrical body with pointed base, a long narrow neck, and two straight handles. Hölder^[3199] notes several varieties: the Canopic, the wide-bellied, the cylindrical, the globular, and the spheroidal, the former of which is a typical early form in the provinces.^[3200] It was often without neck or handle, and was seldom ornamented, not being used for artistic purposes like its Greek prototype, but only for strictly utilitarian ends, that is, for the storage and transport of wine. It is usually of coarse red earthenware, made on the wheel, with a clay stopper to close the mouth, and the name of the maker in a rectangular label on the handle, like the diota or wine-amphora of the Greeks. It was in fact often known as a diota, as in a familiar line of Horace^[3201]: