The earliest windows of this period are long and narrow, with acutely pointed heads, the exterior angle being merely chamfered and the interior widely splayed. Somewhat later the introduction of tracery gave a highly beautiful appearance to the windows and from the character of this feature the date of the window can be fairly accurately determined. Where the tracery is formed by ornamental apertures pierced through a plate of stone, it is called plate tracery, and is certain to be of not later date than the earlier part of the 13th century. If it is bar tracery, with the bars forming plain circles, the work is also Early English, but if, on the other hand, the bars form other shapes filled in with patterns, or consisting of a single trefoil or quatrefoil, they are of later date. [Illustration: The Church of St. Margaret, Lynn. West Front showing the Early English work in the base of the Tower. _Photograph Dexter & Son._] [Illustration: Example of Group of Thirteenth Century Lancet Windows. Ockham, Surrey. _Homeland Copyright._] The traceried window originated from the placing of a two-light narrow lancet window under one dripstone having a plain head, the introduction of tracery between the heads of the lancets and the dripstone becoming necessary for beauty and lightness of the form (_see page 47_). [Side note: Early English Porches.] Early English porches project much further from the main walls than do the Norman doorways, and in large and important buildings they frequently have a room above. The gables are usually bold and high pitched, and the interiors quite as rich in design as are the exteriors. [Side note: Early English Doorways.] The doorways of this period are usually pointed, though occasionally they have a semi-circular head. The mouldings are boldly cut and often enriched with dog tooth ornament. The jambs frequently contain a shaft or shafts with plain or foliated capitals (_see page 51_). [Side note: Early English Capitals and Piers.]