them the cathedrals of Langres (Haute-Marne) (end of twelfth century) [(Fig. 80)] and Milan (beg. 1386), while a similar system with one or more added ribs in the outer severy is to be seen at Pontoise (Seine-et-Oise) S. Maclou ([Plate III-h.]), in the cathedral of Rouen ([Plate III-d.]), and in Saint Remi at Reims [(Fig. 83)], which are later described.