The great northern outer nave to the Church of Notre Dame dates also from this epoch (probably 1360). Here we have a striking example of the persistence of a feature rarely if ever met with in Gothic architecture either in England or in France, and which is, perhaps, so far as Northern Europe is concerned, at all events during the period in question, peculiar to Flanders--the semi-circular arch. The architects of Bruges seem never to have entirely abandoned it, and hence in that city its presence does not necessarily indicate that the building in which it is found is of Romanesque origin. Thus we find it in the tower of Notre Dame, which, as we have seen, dates from the close of the thirteenth century; in the northern transept of the cathedral of the same date; in the windows of the _Porte de Gand_, and of the _Porte Ste. Croix_ of a century later; in the great porch of the hospital of St. John, and in the western façade of the Church of Notre Dame, and in domestic architecture of every period, over and over again. Sometimes it is used alone, sometimes in conjunction with the pointed arch. In the case of the northern nave of Notre Dame, it is employed for the vaulting, for the huge doorway at the western end, now bricked up, and for the five small bays of the outer arcade which connect it with the main building, whilst for the windows, for the bays of the inner arcade, and for the great opening at the east end which gives access to the tower, pointed arches are used. For the rest, the building in question is characterised by its great height, the magnificent span of its vault, the grandeur of its proportions and the general simplicity IV.--Genealogical Table of the Counts of Flanders from Guy de Dampierre to Marguerite of Maele.