Upon entering each apartment note should be taken of the character of the fireproof entrance doors. The entrance doors to all apartments, and the trim around these doors, and all the woodwork in any of the public halls must be fireproof in all apartment houses and in all fireproof buildings. These doors may be made of copper, steel, hollow steel, or of wood covered with metal. The window openings on all public halls must be trimmed in like manner. The use of hollow steel is more desirable than the use of Kalamein (wood covered with metal), and the wearing qualities of the former are much greater and present a more effective appearance if properly finished. A cheap Kalamein door will buckle, but a well-made one is desirable and durable. Copper or bronze makes a more handsome but a more costly substitute.