Both have, of course, been credited with some artistic motive. To me it seems that they had found the choir, with its squat pier-arches, intolerably dark; and when they reached the nave, they saw that if they adhered to the early design, the nave would be even darker than the choir. For on the north side the cloister abutted on the aisle-wall, whose windows therefore had to be placed very high up in the wall: giving hardly any light to aisle and nave. To remedy this, therefore, regardless of appearances—for mediæval architects were practical builders first, artists only afterwards—they put up these colossal columns 30 feet high, raising the arches nearly 40 feet above the pavement. In that way the light from the high windows of the north aisle was enabled to penetrate into the church. Another very remarkable feature in the design of the eastern limb is the utilisation of the triforium. In many churches—_e.g._, in Beverley and Lincoln minsters—the triforium seems not to have been intended to be used. At Beverley it is walled off from the nave; at Lincoln it has no floor. But in the earlier churches some ritualistic use must have been made of it. At Winchester, Ely, and the Abbaye-aux-hommes at Caen, return-aisles were constructed at the ends of the transepts to provide a broad path by which processions might pass along the triforium from the choir, round the transept, to the nave. [Illustration: NAVE.] At Gloucester one step further is taken. All the five apses are built two stories high, the upper story of each opening into the triforium: so that five additional chapels are gained for the church. Moreover, since the crypt passes beneath all five apses, another set of five apsidal chapels is obtained underground; so that, without taking into account chapels otherwise arranged for, Gloucester possesses in the minor apses alone no less than fifteen chapels. In fact, leaving out of account the central aisle, Gloucester presbytery is really three churches—an upper, middle, and lower church. The amount of accommodation gained by this ingenious planning is immense. One wonders that the plan of radiating chapels and practicable triforium was not adopted more frequently. It occurred at Tewkesbury and at Leominster; but in the end it was superseded by the eastern transept thrown across the choir centrally, as at Lincoln, or at its eastern termination, as at Fountains. In Lincoln choir, St. Hugh’s architect, hesitating between two opinions, built eastern transepts as well as return-aisles and apsidal chapels.