There are casts in plaster and reproductions in wax illustrating all the dreadful skin diseases and deformities of the limbs, by which the laborers engaged in certain industries become afflicted. Other exhibits illustrate what measures should be taken for the improvement of the conditions of the working classes; how to furnish the best nourishment at the lowest cost; how to settle laborers in pleasant colonies, and how to treat those, who have become sick or afflicted with industrial diseases. Among the most important exhibits are the statistics of three institutions provided for all persons employed in workshops and factories. Germany was first among the nations to recognize the need of reforms in the social conditions of the working classes. Before 1870 wages had been low, and many of the evils that developed in other industrial countries had spread to Germany. Believing that the working classes have a right to be considered by the State the Government in 1881 initiated the era of “State social politics,” which brought about an enormous change in the condition of the working classes. Besides many reforms in regard to the length of the working hours and to women’s and children’s labor, this State socialism provided for three important institutions: first, a compulsory insurance against sickness; second, a compulsory insurance against accidents; third, a compulsory insurance against invalidity and old age. To the funds of the first class all laborers earning less than 2000 marks a year must pay two-thirds, and the employer one-third of the weekly premiums. In case of sickness, the insured person receives half the amount for twenty-six weeks. Doctors, hospitals and medicines are free. In 1913 14,555,609 laborers, men and women, were protected in this way. Many poor mothers were supported for several weeks before and after confinement. To prevent sickness, especially tuberculosis, the institution supported numbers of sanitariums and recreation homes, where thousands of people, who would otherwise have perished, regained their health. The insurance fees against accidents had to be paid entirely by the employer. In case of an accident, it was not the employer in whose factory it had happened who was held responsible, but the whole group of employers in the same branch of industry. Every group was compelled to establish an insurance company. In 1913 there were 25,800,000 men and women thus protected. An injured laborer received, during the time of his disability, two-thirds of his wages, also free medical treatment. In case of his death the family received at once fifteen per cent. of his annual wages and an annual support of sixty per cent. As the employers naturally wish to keep the amount of expenses as low as possible, this kind of compulsory insurance greatly stimulated the invention and institution of measures by which accidents may be prevented.