As some lead poisoning in printing works is attributable to lead colours or bronze powder containing lead their use should be limited as much as possible. The German Imperial Regulations for printing works and type foundries are as follows: ORDER OF THE FEDERAL COUNCIL OF JULY 31ST, 1897, REGULATING LETTERPRESS PRINTING WORKS AND TYPE FOUNDRIES, IN PURSUANCE OF SECTION 120_E_ OF THE INDUSTRIAL CODE I. In rooms in which persons are employed in setting up type or manufacture of type or stereotype plates the following provisions apply: 1. The floor of workrooms shall not be more than a half a meter (1·64 feet) below the ground. Exceptions may only be granted by the higher administrative authority where hygienic conditions are secured by a dry area, and ample means of lighting and ventilating the rooms. Attics may only be used as workrooms if the roof is provided with a lathe and plaster ceiling. 2. In workrooms in which the manufacture of type or stereotype plates is carried on, the number of persons shall not exceed such as would allow at least fifteen cubic meters of air space (529·5 cubic feet) to each. In the rooms in which persons are employed only in other processes, there shall be at least twelve cubic meters of air space (423·5 cubic feet) to each person. In cases of exceptional temporary pressure the higher administrative authority may, on the application of the employer, permit a larger number in the workrooms, for at the most 30 days in the year, but not more than will allow ten cubic meters of air space (353 cubic feet) for each person. 3. The rooms shall be at least 2·60 meters (8· feet) in height where a minimum of fifteen cubic meters are allowed for each person, in other cases at least 3 meters (9·84 feet) in height. The rooms shall be provided with windows which are sufficient in number and size to let in ample light for every part of the work. The windows shall be so constructed that they will open and admit of complete renewal of air in workrooms. Workrooms with sloping roof shall have an average height equal to the measurements given in the first paragraph of this section. 4. The rooms shall be laid with close fitting impervious floor, which can be cleared of dust by moist methods. Wooden floors shall be smoothly planed, and boards fitted to prevent penetration of moisture. All walls and ceilings shall, if they are not of a smooth washable surface or painted in oil, be limewashed once at least a year. If the walls and ceilings are of a smooth washable surface or painted in oil, they shall be washed at least once a year, and the oil paint must, if varnished, be renewed once in ten years, and if not varnished once in five years.