This much is given to show how the glaze was applied to pottery by the nations of that very early time. Where they got their knowledge--whether they discovered it for themselves in their search into the secrets of Nature, or whether they derived it from the great world of life which lay beyond in the far East--we do not and cannot know. But why this so valuable knowledge was not applied universally by those acute peoples to the utensils of every-day life, and to all which we now call "artistic pottery," remains a curious question. That it was applied to some things, we know; for small vases, toys, marbles, etc., etc., have been found among the Egyptian tombs coated with this enamel; but most of the pottery found in Egypt is without glaze, which would indicate that what was in ordinary daily use was unglazed. Examples of this enameled ware are to be seen in the British and other museums of Europe. Coming to the Greeks, it is singular that nothing of this enamel-glaze is found. The inference is, that they had not the knowledge of it, and that the art must have been lost; for surely so valuable and beautiful an art, if known, must have been applied by so æsthetic a people as the Greeks to the uses of life. Upon the Greek vases, of which so many examples remain, there appears sometimes to have been used a very thin and very transparent varnish; but this does not seem to have been a glaze made either of glass, or of lead, or of tin. If it was a varnish, and not a polish, the probabilities point to its being a thin wash of soda or potash. This varnish served to protect the painting, but did not prevent the percolation of water. The Greek methods prevailed among the Romans. Among the great numbers of potters, and the vast production of pottery, the Romans seem not to have used the glaze. All that remains of their work, found in Gaul, in Britain, and in other parts of Europe, is the unglazed ware. The Arabs and the Moors brought into Europe a knowledge of the stanniferous (tin) glaze, as has been explained more fully elsewhere. To this keen and most energetic civilization Europe owes its beginnings in the arts of pottery, as well as in many other things. The value of the glaze in all the arts of life cannot be estimated. When the only cooking-utensils were those made of unglazed pottery, the cooking was of the simplest, if not most insufficient, character. Indeed, at that time it is not likely that meat was cooked in the pot at all. In addition to this, the difficulty of making unglazed vessels capable of holding wine, oil, etc., without wasting them slowly, must have forbidden those things being kept to such a time as to insure perfection, not to mention the inevitable loss. It is likely that such unglazed pots were then painted on the inside with some resinous substance which in a degree met the difficulty, but which, at the same time, imparted a flavor to the wine which we cannot believe to have been delicious.