The numerous aids towards discovering thieves seem to indicate that the difficulty of distinguishing between meum and tuum is of no modern growth. Many religious formulæ were, of course, pressed into the detective service, perhaps the most famous being the curse of Saint Adalbert. Such value was placed upon it that the Church only permitted its employment with the licence of the Bishop under pain of excommunication. It is of interminable length, and commences as follows:--"In the authority of all-powerful God, Father, Son, and Holy Ghost and of the Holy Virgin Mary, mother of our Lord Jesus Christ and of the holy angels and archangels, and of Saint Michael and of John the Baptist, in the name of the apostle Saint Peter and of the other apostles, of Saint Sylvester, Saint Adalbert, and of all Confessors, of Saint Aldegonde, of holy virgins, of all the saints which are in Heaven and on the earth to whom power is given to bind and unbind, we excommunicate, damn, curse, and anathematise and forbid the entrance into Holy Mother Church of these thieves, 'sacrilegists,' ravishers, their companions, coadjutors, and coadjutrices who have committed this theft, or who have taken any part in it," &c., &c. Another method combines an invocation with the use of a crystal:-- Turn towards the East, make a cross above the crystal with olive oil, and write the name of Saint Helen below this cross. Then a young boy of legitimate birth must take the crystal in his right hand, while you kneel down behind him and say three times devoutly, "I pray you, holy Lady Helen, mother of King Constantine, who have found the cross of our Lord Jesus Christ, that in the name and favour of this very holy devotion and invention of the cross; in the name of this very holy cross; in favour of this joy that you experienced when you found this very holy cross; in consideration of the great love you bore your son, King Constantine; in short, in the name of all the good things you enjoy for ever, may it please you to show in this crystal what I ask and am longing to know." Then the boy will see the angel in the crystal, and you will ask what you want, and the angel will reply. This should be done at sunrise and when the sun has risen. A simpler and more homely means runs thus:--