A window in Merton College chapel has _three_ lights: with a circle in the head containing _six sex_-foils. Broughton, Oxon, has in the head of one of its windows a circle, containing two intersecting equilateral triangles, the _six_ apices, and _six_ spaces around, being _tre_-foiled. {xciv} The east end of Lincoln, though far inferior to the south transept of Chichester, is nevertheless highly symbolical. The east window of each of the aisles has _three_ lights, with _three_ foliated circles, disposed _triangle_-wise in the head. The great east window has eight lights in two divisions, each whereof has _three_ foliated circles in the head: and in the apex of the window is a circle containing seven foliations. The upper window has a circle of eight foliations in the head: and in the apex of the gable is an equilateral trefoil. The next element introduced was the consideration of the Six Attributes of the Deity. One of the simplest examples was to be found in the west window of the north aisle of S. Nicholas, at Guildford: a plain circle, containing six _tre_-foils: these are arranged in two _tri_-angles, each containing _three tre_-foils, and the two sets are varied. The clerestory of Lichfield cathedral (circ. 1300), is a series of spherical _tri_-angles, each containing _three tre_-foils. A similar clerestory occurs in the north-west transept of Hereford cathedral, and the same idea is repeated in its triforium: a series of _three tre_-foiled lights, with _three_ circles in the head. The east end of Lichfield symbolises most strikingly the same glorious doctrine. The apse is _tri_-gonal: the windows of each side are the same: each is of _three_ lights, with six _tre_-foils (emblematical of the six attributes) disposed above in the form of an equilateral _tri_-angle. The east end of Chichester is rather earlier, but introduces yet another element. Here we have a triplet: and at some height above it, a wheel-window of seven circles: symbolising therefore eternity and perfection. {xcv} The triforium and clerestory of Carlisle are singular symbols of the doctrine of the Trinity. The former has in each bay three adjacent equal lancets. The latter is a series of triplets; the central window in each being composed of three lights. We may observe, by the way, that three _adjacent_ equal lancets are hardly ever found, whatever the reason may be. We know but of three examples: in the churches of Bosham, Sussex, Godalming, Surrey, and S. Mary-le-Crypt, Gloucester: and in all these cases they occupy the same position, the south east end of the chancel, or chancel aisle. Dorchester church, Oxfordshire, has for one of its windows an equilateral spherical triangle with three heads, or knops, one at each angle.