The deeply recessed Norman doorways in English work required a great thickness of wall, and this was sometimes obtained by an addition outside, as at Iffley, Adel, Kirkstall and other churches.
In France, during the Gothic period, the several orders were carved with figure sculpture, as also the door jambs; and the great recessing of these doorways brought them more into the categories of porches. In England much less importance was given to the Gothic doorways, and although they consisted of many orders, these were emphasized only by deep hollows and converse mouldings and always carried on angle or nook shafts. In the perpendicular period the pointed-arch doorway was often enclosed within a square head-moulding, the spandrel being enriched with foliage or quatrefoil tracery.
In the Mahommedan style the doorway itself is comparatively simple, except that the voussoirs of its lintel are joggled with a series of curves, and being of different coloured stones have a decorative effect. These doorways are placed in a rectangular recess roofed with the stalactite vault.
With the Renaissance architect, the doorway continued as the principal characteristic of the style; the actual door-frame was simply moulded, by enclosing it with pilasters or columns, isolated or semi-detached, raised on pedestals and carrying an entablature with pediment and other kind of super-doorway; and great importance was given to the feature. In the Italian cinquecento period, the panels of the side pilasters were enriched with the most elaborate carving, and this would seem to have been an ancient Roman method, to judge by portions of carved panels now in the museums of Rome. The doorways of Venice are remarkable in this respect. At Como the two side doorways of the cathedral, one of which is said to be by Bramante, are of great beauty, and the same rich decoration is found throughout Spain and France. In Germany and England the pattern book too often suggested designs of an extremely rococo character, and it was under the influence of Palladio, through Inigo Jones, that in England the architect returned to the simpler and purer Italian style. (R. P. S.)
DOPPLERITE, a naturally occurring organic substance found in amorphous, elastic or jelly-like masses, of brownish-black colour, in peat beds in Styria and in Switzerland. It is tasteless, insoluble in alcohol and ether, and is described by Dana as an acid substance, or mixture of different acids, related to humic acid.