Door knockers in use during the Medieval period were perhaps the most carefully designed, while those of the Renaissance period showed the most fanciful treatment. It must be remembered, when considering the ornamental qualities of both these types of knockers, and comparing them with latter-day productions, that they were made at a time when designers were practically unknown, artists being employed to draw patterns which were worked out by assistants under the supervision of master smiths, which method resulted in a greater diversity of treatment. Iron was at first used in the construction of knockers, partly on account of its inexpensiveness, and the results secured from this seemingly ugly material were both artistic and beautiful. Later, brass came into favor for the purpose, and it has since remained the principal knocker material, as no better substitute has been found. Brightly polished, a brass knocker undeniably adds to the decorative attractiveness of any door. During the fifteenth and sixteenth centuries, knockers were used on all classes of houses. These for the most part were very elaborate in design, showing a wonderful delicacy of workmanship, and they were in many instances larger than those found on modern colonial homes. Except for the period during the seventeenth century, as above mentioned, door knockers remained in favor until the middle of the nineteenth century, when a wave of modernity, sweeping the length and breadth of the land, brought in its wake an overthrow of colonial ideas and furnishings. Modern doors, plain of surface, replaced the finely paneled old-time ones, and with their coming disappeared the knocker and the latch. Probably the principal cause of this was the demolition of many of the old landmarks, and the substitution of dwellings of an entirely different architectural type. This innovation for a second time consigned the knocker to oblivion, and many there were who, not realizing its artistic value, cast it into the scrap heap. Others, with a veneration for heirlooms, packed the knockers away in old hair trunks under the eaves of the spacious attic, together with other antiques of varying character. No doubt the greatest number were saved by the wise and far-sighted collector, who, realizing the artistic beauty of the knocker, felt that it would in time come to its own again. Quietly he purchased them and stored them away, awaiting the day of their revival, and his foresight was amply repaid when the modified colonial house came into vogue, demanding that the knocker should again be the doorway's chief feature. Many of those now shown are genuine antiques, while others are reproductions, but so carefully copied that only to one who has made a study of antiques is the difference discernible.