Many of the doorways show an innovation in the presence of the climbing vine, which winds its tendrils about the pillar supports, emphasizing their beauty. It is not definitely known whether the early owners encouraged the vine-covered porch or not, but they probably did, as they delighted in the vine-covered summer-house, which was a feature of nearly every old-time garden. While Salem may hold a prominent rank in attractive porches, many fine examples are to be found in Philadelphia, and though these specimens differ radically in design, they are most attractive. One is to be seen on Independence Hall on Chestnut Street, while others are found on churches and houses. These doorways illustrate a phase of architectural construction totally different from the porches of New England and those of the South, yet they combine features of the other types, while at the same time displaying a certain definite style of their own which gives to them as great distinctiveness as characterizes Salem porches. If the twentieth-century architect desires studies of truly attractive doorways, the seaport towns of New England will afford him excellent models. There is enough variety here in porches which are still preserved to give him any number of models from which to devise an entrance that will serve its purpose in every sense of the word. For the home builder, it will not be amiss to carefully consider the best type of porch before he goes to the architect to develop his plans; he can be assured that study will develop ideas that will give to his home an individuality that will embody his ideas and personality. CHAPTER III DOOR KNOCKERS There is no more decorative feature of the entrance door than the old-time door knocker, especially if in conjunction with it are used a latch and hinge. It possesses a dignity and charm that is most attractive, and when shown in brass, brightly burnished, it forms a most effective foil for the dark or polished surface of the wood. Door knockers have been in use, save for short periods during the seventeenth and nineteenth centuries, since their invention, early in the world's history, although they were most freely used during the Romanesque, the Gothic, and the Renaissance periods. For easy identification they may be divided into three classes, the first characterized by a ring, the second by a hammer, and the third by human figures and animals' heads. The first two types show a much larger surface of plate than the third, and the designs employed are often most elaborate.