The chief elements which mark the Transition style are the gradual introduction of the pointed arch and its use along with some of the decorative features of the Norman style. The pointed arch shows the advent of the new style, but the ornaments of the old style continue to linger for a time. The first pointed style was not complete till these old ornaments were abandoned, and the more vigorous enrichments of the new style were introduced. The other constructive features of the Norman style gradually changed at the same time as the arch. The buttresses by degrees assumed the projecting form of the first pointed style, and the pinnacles and spires of the latter style were in course of time introduced. During the progress of the Transition there was naturally a considerable mixture of architectural elements. The round and the pointed arch were used indiscriminately, and were frequently employed together in the same structure, round arches being sometimes placed above pointed arches. Of this there are examples in the nave of Jedburgh Abbey and the south transept of Elgin Cathedral. In other instances, although the building is chiefly Norman, the pointed style is introduced in certain positions; as, for example, at Kelso Abbey, where to all appearance, contemporarily with the Norman walls, the piers and pointed arches of the crossing are in the first pointed style. At Dundrennan Abbey we find the older Norman work partly converted into first pointed by alteration, and in other examples, such as Coldingham, there is a mixture of the features of the two styles. In many of the examples of the different periods, given or to be given, some Norman features may be discovered which, it might be thought, entitled the structures to be ranked as transitional. The buildings, however, have been arranged under the various periods to which the most prominent, not the most ancient, portions of their architecture belong. In England the period of Transition extends from about 1180 to 1200; but, as we shall find, the corresponding period in Scotland extends considerably into the thirteenth century. DUNDRENNAN ABBEY, KIRKCUDBRIGHTSHIRE. The greater part of this very interesting structure has been demolished, but what remains is so fine as to make one regret all the more the hard usage the demolished portions have met with. The abbey stood in a small, but deep, valley on a few acres of comparatively level ground lying on the west side of a little stream called the Abbey Burn, about a mile and a-half from the sea. The edifice is concealed in this remote and buried situation, and is with difficulty discovered after traversing a hilly road of six or seven miles south-east from Kirkcudbright. But when found, the quiet and secluded site, and the peaceful aspect of the grey ruins, surrounded with ancient trees, are very charming.