"Suppose, then, we begin," he said, "and I will try before luncheon to introduce you to our second great potter. But before I do this we must go back a little that you may recall exactly where we left off. While Holland was turning out its Delft ware; Italy its glazed terra-cotta; and France its Henri Deux and other enameled earthenwares, in the Low Countries and the German States a new variety of pottery with a coarse surface not unlike the porous skin of an orange was being made. This was known as Gres de Flandres, _gres_ meaning earthenware. The unique feature it possessed was not so much its orange-skin surface as the surprising method by which it was glazed. The ware itself was made on a potter's wheel often from the commonplace kinds of clay, such as are employed in making stone china; sometimes this was brown, sometimes gray, sometimes cream-colored. There was nothing original about the material employed. But afterward--then came the amazing thing! When the clay articles were put into the kiln to be fired a quantity of common salt was thrown in with them and this salt created a vapor which when it settled upon the ware fused with it, giving to the clay a coarse, porous-appearing surface." "How do you suppose anybody ever thought of using salt?" inquired Theo. "I do not know. Probably the discovery, like so many others, was a mere happen-so. At any rate it was a fortunate happening, for immediately this method of glazing earthenware was carried to England, where Doulton of Lambeth began manufacturing some very beautiful gres. For gres can be of exquisite beauty as well as of most ordinary type. Do not forget that. The term serves to cover those opaque earthenwares which are fired until vitrification or an external glassing results. At first all styles of gres were called Gres de Flandres, but later the single term gres was given them. You will hardly be surprised when I tell you that those past masters in the art of every kind of pottery-making, the Chinese and Japanese, have given us our finest specimens of gres, some of them having designs of imitation jewels upon them; and others decorations of beautifully colored enamels. Next to these Oriental varieties Germany has always excelled in the making of gres. There is a great scope for artistic expression in this ware, a far broader range for merit than in many others." "So it was this salt glaze that England took up, was it?" ruminated Theo.