There is another small edifice called a Baptistery at Ratisbon, built in the last years of the 12th century, which shows this form passing rapidly away, and changing into the rectangular. It is in reality a square with apses on three sides, and vaulted with an octagonal dome. As we have just seen, the same arrangement forms the principal as well as the most pleasing characteristic of the Cologne churches, where on a larger scale it shows capabilities which we cannot but regret were never carried to their legitimate termination. The present is a singularly pleasing specimen of the class, though very small, and wanting the nave, the addition of which gives such value to the triapsal form at Cologne, and shows how gracefully its lines inevitably group together. On the spot it is still called the Baptistery; but the correct tradition, I believe, is that it was built for the tomb-house of the bishop to whom it owes its erection. [Illustration: 730. The Matthias Chapel at Cobern on the Moselle. (From Wiebeking.) No scale.] One more specimen will serve to illustrate nearly all the known forms of this class. It is a little chapel at Cobern on the Moselle (Woodcut No. 730), hexagonal in plan, with an apse, placed most unsymmetrically with reference to the entrance—so at least we should consider it; but the Germans seem always to have been of opinion that a side entrance was preferable to one opposite the principal point of interest. The details of this chapel are remarkably elegant, and its external form is a very favourable specimen of the German style just before it was superseded in the beginning of the 13th century by the French pointed style. There is, besides these, a circular chapel of uncertain date at Altenfurt near Nuremberg, and there are many others at Prague and in various parts of Germany, but none remarkable either for their historical or for their artistic importance. This form went out of use before the style we are describing reached its acmé; and it had not therefore a fair chance of receiving that elaboration which was necessary for the development of its capabilities. A little farther on we shall have occasion again to take up the subject of circular churches when speaking of those of Scandinavia, where the circular form prevailed to a great extent in the early ages of Christianity in that country; never, however, as a baptistery or a tomb-house, but always as a kirk. It was afterwards introduced by the Danes into Norfolk and Suffolk, but there still farther modified, becoming only a western round tower, instead of a circular nave. CHAPTER IV. DOMESTIC ARCHITECTURE. CONTENTS. Lorsch—Palaces on the Wartburg and at Gelnhausen—Houses—Windows.