The revelation of T´ang ceramics has provided many surprises, and doubtless there are more in store for us. There are certainly many gaps to fill and many apparent anomalies to explain. We are still in the dark with regard to the potter's art of the four hundred years which separate the Han and T´ang dynasties. The Buddhist sculptures of this time reveal a high level of artistic development, and we may assume that the minor arts, and pottery among them, were not neglected. When some light is shed from excavation or otherwise upon this obscure interval, no doubt we shall see that we have fixed our boundaries too rigidly, and that the Han types must be carried forward and the T´ang types carried back to bridge the gap. Meanwhile, we can only make the best of the facts which have been revealed at present, keeping our classification as elastic as possible. Probably the soft lead glazes belong to the earlier part of the T´ang period and extend back to the Sui and Wei, linking up with the green glaze of the Han pottery, while the high-fired glazes tended to supersede these in the latter part of the dynasty. The high-fired feldspathic glazes seem to have held the field entirely in the Sung dynasty, and the lead glazes, as far as our observation goes, do not reappear until the Ming dynasty. The Sung is the age of high-fired glazes, splendid in their lavish richness and in the subtle and often unforeseen tints which emerge from their opalescent depths. It is also an age of bold, free potting, robust and virile forms, an age of pottery in its purest manifestation. Painted ornament was used at certain factories in black and coloured clays, and, it would seem, even in red and green enamels; but painted ornament was less esteemed than the true ceramic decoration obtained by carving, incising, and moulding--processes which the potters worked with the clay alone. If we could rest content with a comprehensive classification of the Sung wares, as we have had perforce to do in the case of the T´ang, one of the chief difficulties in this part of our task would be avoided. But the Chinese have given us a number of important headings, under which it has become obligatory to try and group our specimens. Some of these types have been clearly identified, but there are others which still remain vague and ill-defined; and there are many specimens, especially among the coarser kinds of ware, which cannot be referred to any of the main groups. But the true collector will not find the difficulties connected with the Sung wares in any way discouraging. He will revel in them, taking pleasure in the fact that he has new ground to break, many riddles to solve, and a subject to master which is worthy of his steel.