of blind arcades belonging by the details of their ornamentation to the XIIIth century, while their arcs are frankly semicircular arch (fig. 4). In Burgundy the arc semicircular arch even persists
in the blind arcades until worms medium of the XIIIth century. The small church of Our-injury of Dijon, whose construction is posterior with the church of the abbey of Vézelay, still lets see in the bases of its vaults of the transept, of beautiful blind arcades semicircular arch on capitals which do not have anything any more the Romance ornamentation. The curve in tierce point applies to the archivolts of the blind arcades only about 1230, the trefoil arch is used as transition, one sees it employed in the northern transept of the Midsummer's Day church of
The Châlons-on-Marne (fig. 5), from which the lower part goes back to 1220 to 1230; in the still existing spans on the low sides of the cathedral of Amiens, even date; later, of 1230 to 1240, the arc in tierce point only reigns (fig. 6),
as one can see it in the vaults of the chorus of the
