I must say little more about Rouen; but I ought not to forget to notice the fine and very varied treatment of the capitals throughout the nave, and the thoroughly Norman (and English) effect of the immense numbers of clustered shafts, of which all the piers are composed. The double division in height of the main arcade is not easily accounted for; but if it was owing to an alteration in the height of the building, while it was in progress, it is a happy instance to be added to many others, of the skill with which mediaeval architects seized upon difficulties as the best opportunities for achieving successes. The ground-plan of this cathedral is, I think, altogether one of the best in France. In particular the _chevet_ is of great beauty. The aisle round the apse, instead of being completely surrounded by chapels, has its alternate bays only so occupied, with great advantage in point of effect, both internally and externally. The arrangement is almost identical with that of the fine _chevet_ of S. Omer cathedral, and appears to me to be a happy mean between the one chapel at the east end of Sens, and the cluster of chapels which crowd the apsidal ends of almost all the great churches in the north of France. Whilst in its plan it is more skilfully disposed than the somewhat similar _chevet_ of Chartres, it is preferable to those of Mantes and Notre Dame, Paris, where there were no projecting apsidal chapels,[15] or Bourges, where they are so small as to produce no effect. The north-west tower (that of S. Romain), should be ascended, if only to examine the framework of the roof and for the bells, and to note, among other things, the open wooden staircase in its upper stage. The view, too, of the city is finely seen; and I know few cities that reward more bountifully any trouble taken in the attempt to see them in this way. A city it is, indeed, of desecrated churches, but still a city whose situation on the noble river winding here under great chalk hills, and there along the edge of meadows green, flat and extensive, fringed with long perspective lines of poplars, is as beautiful and as happy as it can well be.