Of this style, this is what Mr. Parker says: "The name is derived from the arrangement of the tracery, which consists of perpendicular lines, and forms one of its most striking features. At its first appearance the general effect was usually bold and good; the mouldings, though not equal to the best of the Decorated style, were well defined; the enrichments effective and ample without exuberance, and the details delicate without extravagant minuteness. Subsequently it underwent a gradual debasement: the arches became depressed; the mouldings impoverished; the ornaments crowded, and often coarsely executed; and the subordinate features confused from the smallness and complexity of their parts. A leading characteristic of the style, and one which prevails throughout its continuance, is the square arrangement of the mouldings over the heads of doorways, creating a spandrel on each side above the arch, which is usually ornamented with tracery, foliage, or a shield. The jambs of doorways are generally moulded, frequently with one or more small shafts." The style is one that did not allow of much variety in window tracery. The object of the adoption of upright panels of glass was to allow of stained figures in glass of angels filling the lights, as there had been a difficulty found in suitably filling the tracery of the heads of the windows with subjects when these heads were occupied by geometrical figures composed of circles and arcs intersecting. In the west window of Exeter Cathedral may be seen a capital example of "Decorated" tracery, and in the east window one in the "Perpendicular" style. Skill in glass staining and painting had become advanced, and the windows were made much larger than before, so as to admit of the introduction of more stained glass. Pointed arches struck from two centres had succeeded round arches struck from a single centre, and now the arches were made four-centred. Foliage in carving had, under Early English treatment, been represented as just bursting, the leaves uncurling with the breath of spring. In the Decorated style the foliage is in full summer expansion, generally wreathed round a capital. Superb examples of Decorated foliage may be seen in the corbels in the choir at Exeter. In Perpendicular architecture the leaves are crisped and wrinkled with frost. In Devonshire the earlier towers had spires. When the great wave of church building came over the land, after the conclusion of the Wars of the Roses, then no more spires were erected, but towers with buttresses, and battlemented and pinnacled square heads. In the country there are no towers that come up to the splendid examples in Somersetshire; but that of Chittlehampton is the nearest approach to one of these.