Along the exterior of the upper part of the nave, runs a row of twenty-four semi-circular arches, with imposts and bases, and all uniform, except that eight of them are pierced for windows. This portion of the building is entirely without buttresses. Upon the extremity of the north transept are three very shallow buttresses, which rise from the ground to the bottom of the clerestory windows, unbroken by any interruption whatever, but here meet with a string-course, beyond which the two outer ones are continued, unchanged in form and appearance, to the summit of the ends of the gable, while the centre one, though it is raised to an equal height, loses more than half its width, and is also much reduced in depth. Over this latter buttress is a window; and between the buttresses are six others, arranged in a double row. Each pair differs in size from the rest: those nearest the ground are the largest, and those immediately above them the least. The lowest pair on each side is inclosed within a spacious arch, which occupies nearly two-thirds of the gable. Eastward of the transepts is a series of blank intersecting arches, remarkable for their mouldings, which consist of a flat, wide, and very shallow band;[45] and here the mixture of the pointed with the semi-circular architecture commences. This portion of the building altogether resembles the cathedral of Coutances in the disposition of its parts. [Illustration: Plate 23. ABBEY CHURCH OF ST. ETIENNE, CAEN. _Elevation of compartment of the Nave._]