Hecker gives some remarkable instances of the effect of sympathy or imitation exhibited on a smaller scale than in the epidemics of the Middle Ages. One is of a series of cases of fits in a Lancashire factory, the first one brought on by a girl putting a mouse into the bosom of another. In Charité Hospital in Berlin in 1801 a patient fell into strong convulsions, and immediately afterward six other patients were affected in the same way; by degrees eight more were attacked. At Redruth, England, a man cried out in a chapel, “What shall I do to be saved?” Others followed his example, and shortly after suffered most excruciating bodily pain. The occurrence soon became public; hundreds came, and many of them were affected in the same way. The affection spread from town to town. Four thousand people were said in a short time to be affected with this malady, which included convulsions. Hecker in the edition of his work referred to has also a treatise on child pilgrimages.[52] These pilgrimages, like the dancing mania, occurred in the Middle Ages. The greatest was the boy crusade in the year 1212. The passion to repossess the Holy Land then had its grip on Catholic Europe. The first impulse to the child pilgrimages was given by a shepherd-boy, who had revelations and ecstatic seizures, and held himself to be an ambassador of the Lord. Soon thirty thousand souls came to partake of his revelations; new child-prophets and miracle-workers arose; the children of rich and poor flocked together from all quarters; parents were unable to restrain them, and some even began to urge them. A host of boys, armed and unarmed, assembled at Vendôme, and started for Jerusalem with a boy-prophet at their head. They got to Marseilles, and embarked on seven large ships. Two ships were wrecked, and not a soul was saved. The other five ships reached Bougia and Alexandria, and the young crusaders were all sold as slaves to the Saracens. In Germany child-prophets arose, especially in the Rhine countries and far eastward. An army of them gathered together, crossed the Alps, and reached Genoa. They were soon scattered; many perished; many were retained as servants in foreign lands; some reached Rome. A second child's pilgrimage occurred twenty-five years later. It was confined to the city of Erfurt. One thousand children wandered, dancing {225} and leaping, to Armstadt, and were brought back in carts. Another child's pilgrimage from Halle, in Suabia, to Mount St. Michel in Normandy, occurred in 1458. [Footnote 52: Translated by Robert H. Cooke, M. R. C. S.] In the convent of Yvertet in the territory of Liège, in 1550, the inmates were seized with a leaping and jumping malady. The disorder began with a single individual, and was soon propagated.