---- his coral red, his Yeiraku seal, 198-199 ---- his Kairaku ware in Kishiu, 200 ---- Hozen at Kutani, 205 Zurich, porcelain made at, 270 Printed by T. and A. CONSTABLE, Printers to His Majesty at the Edinburgh University Press FOOTNOTES: [1] Some English porcelain is stated by Professor Church to have a hardness equal to that of quartz. See below, ‘Bristol Porcelain.’ [2] We have thought it well, once for all, to treat briefly of the scientific aspect of our subject, but those who are not interested in this point of view may pass over the next few pages. [3] I shall return to this point in a later chapter. I lay the more stress on this fact, as it is often stated that the hard and slightly translucent stonewares, such as the Fulham ware of Dwight, which contains as much as eighty per cent. of silica, form one degree of a series of which true porcelain is the next term. The fact is, those who sought to make porcelain by a refinement in the manufacture of stoneware were as much astray as those who started from a fusible glass frit. [4] The china-stone of Cornwall might, in part at least, be claimed as an old volcanic rock, and that used in the Imari district of Japan is distinctly of volcanic origin. Both these rocks, however, consist essentially of a mixture of quartz and felspar. [5] For further details consult the authorities quoted in the _Handbook_ of the Jermyn Street Collection, p. 5; for sections showing the relation of the beds of kaolin to the surrounding rock, see Brongniart’s _Traité des Arts Céramiques_, vol. i. [6] It is to the scattered notices and essays of Mr. William Burton that we must go for information in this country. In his new work on _English Porcelain_ he does not treat upon this side of the subject. [7] The most complete work on the processes of manufacture is now Dubreuil’s _La Porcelaine_, Paris, 1885. It forms part forty-two in Fremy’s _Encyclopédie Chimique_. This volume brings up to date and replaces in some measure the great work of Alexandre Brongniart, the _Traité des Arts Céramiques_ (two volumes, with a quarto volume of plates), Paris, 1844. M. Georges Vogt in _La Porcelaine_, Paris, 1893, gives valuable details of the processes employed at Sèvres. [8] The _cailloux_ of the French. This material is often described as felspar, but I think that quartz can seldom be completely absent. [9] I should, however, be inclined to class not only much of the porcelain of Japan, but some of that made in Germany and in south-west France, rather in the ‘severe’ kaolinic than in the intermediary class of M. Vogt.